diff --git a/package.json b/package.json
index 42ba5e2..374b075 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.2.2",
-    "@babel/plugin-proposal-class-properties": "^7.2.2",
+    "@babel/plugin-proposal-class-properties": "^7.7.4",
     "@babel/plugin-proposal-decorators": "^7.2.2",
     "@babel/plugin-proposal-nullish-coalescing-operator": "^7.4.4",
     "@babel/plugin-proposal-optional-chaining": "^7.2.0",
diff --git a/yarn.lock b/yarn.lock
index c021404..8993ce9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -39,6 +39,16 @@
     lodash "^4.17.13"
     source-map "^0.5.0"
 
+"@babel/generator@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.7.4.tgz#db651e2840ca9aa66f327dcec1dc5f5fa9611369"
+  integrity sha512-m5qo2WgdOJeyYngKImbkyQrnUN1mPceaG5BV+G0E3gWsa4l/jCSryWJdM2x8OuGAOyh+3d5pVYfZWCiNFtynxg==
+  dependencies:
+    "@babel/types" "^7.7.4"
+    jsesc "^2.5.1"
+    lodash "^4.17.13"
+    source-map "^0.5.0"
+
 "@babel/helper-annotate-as-pure@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0.tgz#323d39dd0b50e10c7c06ca7d7638e6864d8c5c32"
@@ -71,17 +81,17 @@
     "@babel/traverse" "^7.4.4"
     "@babel/types" "^7.4.4"
 
-"@babel/helper-create-class-features-plugin@^7.5.5", "@babel/helper-create-class-features-plugin@^7.6.0":
-  version "7.6.0"
-  resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.6.0.tgz#769711acca889be371e9bc2eb68641d55218021f"
-  integrity sha512-O1QWBko4fzGju6VoVvrZg0RROCVifcLxiApnGP3OWfWzvxRZFCoBD81K5ur5e3bVY2Vf/5rIJm8cqPKn8HUJng==
+"@babel/helper-create-class-features-plugin@^7.6.0", "@babel/helper-create-class-features-plugin@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.7.4.tgz#fce60939fd50618610942320a8d951b3b639da2d"
+  integrity sha512-l+OnKACG4uiDHQ/aJT8dwpR+LhCJALxL0mJ6nzjB25e5IPwqV1VOsY7ah6UB1DG+VOXAIMtuC54rFJGiHkxjgA==
   dependencies:
-    "@babel/helper-function-name" "^7.1.0"
-    "@babel/helper-member-expression-to-functions" "^7.5.5"
-    "@babel/helper-optimise-call-expression" "^7.0.0"
+    "@babel/helper-function-name" "^7.7.4"
+    "@babel/helper-member-expression-to-functions" "^7.7.4"
+    "@babel/helper-optimise-call-expression" "^7.7.4"
     "@babel/helper-plugin-utils" "^7.0.0"
-    "@babel/helper-replace-supers" "^7.5.5"
-    "@babel/helper-split-export-declaration" "^7.4.4"
+    "@babel/helper-replace-supers" "^7.7.4"
+    "@babel/helper-split-export-declaration" "^7.7.4"
 
 "@babel/helper-define-map@^7.5.5":
   version "7.5.5"
@@ -109,6 +119,15 @@
     "@babel/template" "^7.1.0"
     "@babel/types" "^7.0.0"
 
+"@babel/helper-function-name@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.7.4.tgz#ab6e041e7135d436d8f0a3eca15de5b67a341a2e"
+  integrity sha512-AnkGIdiBhEuiwdoMnKm7jfPfqItZhgRaZfMg1XX3bS25INOnLPjPG1Ppnajh8eqgt5kPJnfqrRHqFqmjKDZLzQ==
+  dependencies:
+    "@babel/helper-get-function-arity" "^7.7.4"
+    "@babel/template" "^7.7.4"
+    "@babel/types" "^7.7.4"
+
 "@babel/helper-get-function-arity@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz#83572d4320e2a4657263734113c42868b64e49c3"
@@ -116,6 +135,13 @@
   dependencies:
     "@babel/types" "^7.0.0"
 
+"@babel/helper-get-function-arity@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.7.4.tgz#cb46348d2f8808e632f0ab048172130e636005f0"
+  integrity sha512-QTGKEdCkjgzgfJ3bAyRwF4yyT3pg+vDgan8DSivq1eS0gwi+KGKE5x8kRcbeFTb/673mkO5SN1IZfmCfA5o+EA==
+  dependencies:
+    "@babel/types" "^7.7.4"
+
 "@babel/helper-hoist-variables@^7.4.4":
   version "7.4.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-hoist-variables/-/helper-hoist-variables-7.4.4.tgz#0298b5f25c8c09c53102d52ac4a98f773eb2850a"
@@ -130,6 +156,13 @@
   dependencies:
     "@babel/types" "^7.5.5"
 
+"@babel/helper-member-expression-to-functions@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.7.4.tgz#356438e2569df7321a8326644d4b790d2122cb74"
+  integrity sha512-9KcA1X2E3OjXl/ykfMMInBK+uVdfIVakVe7W7Lg3wfXUNyS3Q1HWLFRwZIjhqiCGbslummPDnmb7vIekS0C1vw==
+  dependencies:
+    "@babel/types" "^7.7.4"
+
 "@babel/helper-module-imports@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz#96081b7111e486da4d2cd971ad1a4fe216cc2e3d"
@@ -156,6 +189,13 @@
   dependencies:
     "@babel/types" "^7.0.0"
 
+"@babel/helper-optimise-call-expression@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.7.4.tgz#034af31370d2995242aa4df402c3b7794b2dcdf2"
+  integrity sha512-VB7gWZ2fDkSuqW6b1AKXkJWO5NyNI3bFL/kK79/30moK57blr6NbH8xcl2XcKCwOmJosftWunZqfO84IGq3ZZg==
+  dependencies:
+    "@babel/types" "^7.7.4"
+
 "@babel/helper-plugin-utils@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz#bbb3fbee98661c569034237cc03967ba99b4f250"
@@ -189,6 +229,16 @@
     "@babel/traverse" "^7.5.5"
     "@babel/types" "^7.5.5"
 
+"@babel/helper-replace-supers@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-replace-supers/-/helper-replace-supers-7.7.4.tgz#3c881a6a6a7571275a72d82e6107126ec9e2cdd2"
+  integrity sha512-pP0tfgg9hsZWo5ZboYGuBn/bbYT/hdLPVSS4NMmiRJdwWhP0IznPwN9AE1JwyGsjSPLC364I0Qh5p+EPkGPNpg==
+  dependencies:
+    "@babel/helper-member-expression-to-functions" "^7.7.4"
+    "@babel/helper-optimise-call-expression" "^7.7.4"
+    "@babel/traverse" "^7.7.4"
+    "@babel/types" "^7.7.4"
+
 "@babel/helper-simple-access@^7.1.0":
   version "7.1.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-simple-access/-/helper-simple-access-7.1.0.tgz#65eeb954c8c245beaa4e859da6188f39d71e585c"
@@ -204,6 +254,13 @@
   dependencies:
     "@babel/types" "^7.4.4"
 
+"@babel/helper-split-export-declaration@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.7.4.tgz#57292af60443c4a3622cf74040ddc28e68336fd8"
+  integrity sha512-guAg1SXFcVr04Guk9eq0S4/rWS++sbmyqosJzVs8+1fH5NI+ZcmkaSkc7dmtAFbHFva6yRJnjW3yAcGxjueDug==
+  dependencies:
+    "@babel/types" "^7.7.4"
+
 "@babel/helper-wrap-function@^7.1.0":
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-wrap-function/-/helper-wrap-function-7.2.0.tgz#c4e0012445769e2815b55296ead43a958549f6fa"
@@ -237,6 +294,11 @@
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.6.2.tgz#205e9c95e16ba3b8b96090677a67c9d6075b70a1"
   integrity sha512-mdFqWrSPCmikBoaBYMuBulzTIKuXVPtEISFbRRVNwMWpCms/hmE2kRq0bblUHaNRKrjRlmVbx1sDHmjmRgD2Xg==
 
+"@babel/parser@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.7.4.tgz#75ab2d7110c2cf2fa949959afb05fa346d2231bb"
+  integrity sha512-jIwvLO0zCL+O/LmEJQjWA75MQTWwx3c3u2JOTDK5D3/9egrWRRA0/0hk9XXywYnXZVVpzrBYeIQTmhwUaePI9g==
+
 "@babel/plugin-proposal-async-generator-functions@^7.2.0":
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-async-generator-functions/-/plugin-proposal-async-generator-functions-7.2.0.tgz#b289b306669dce4ad20b0252889a15768c9d417e"
@@ -246,12 +308,12 @@
     "@babel/helper-remap-async-to-generator" "^7.1.0"
     "@babel/plugin-syntax-async-generators" "^7.2.0"
 
-"@babel/plugin-proposal-class-properties@^7.2.2":
-  version "7.5.5"
-  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.5.5.tgz#a974cfae1e37c3110e71f3c6a2e48b8e71958cd4"
-  integrity sha512-AF79FsnWFxjlaosgdi421vmYG6/jg79bVD0dpD44QdgobzHKuLZ6S3vl8la9qIeSwGi8i1fS0O1mfuDAAdo1/A==
+"@babel/plugin-proposal-class-properties@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.7.4.tgz#2f964f0cb18b948450362742e33e15211e77c2ba"
+  integrity sha512-EcuXeV4Hv1X3+Q1TsuOmyyxeTRiSqurGJ26+I/FW1WbymmRRapVORm6x1Zl3iDIHyRxEs+VXWp6qnlcfcJSbbw==
   dependencies:
-    "@babel/helper-create-class-features-plugin" "^7.5.5"
+    "@babel/helper-create-class-features-plugin" "^7.7.4"
     "@babel/helper-plugin-utils" "^7.0.0"
 
 "@babel/plugin-proposal-decorators@^7.2.2":
@@ -752,6 +814,15 @@
     "@babel/parser" "^7.6.0"
     "@babel/types" "^7.6.0"
 
+"@babel/template@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.7.4.tgz#428a7d9eecffe27deac0a98e23bf8e3675d2a77b"
+  integrity sha512-qUzihgVPguAzXCK7WXw8pqs6cEwi54s3E+HrejlkuWO6ivMKx9hZl3Y2fSXp9i5HgyWmj7RKP+ulaYnKM4yYxw==
+  dependencies:
+    "@babel/code-frame" "^7.0.0"
+    "@babel/parser" "^7.7.4"
+    "@babel/types" "^7.7.4"
+
 "@babel/traverse@^7.0.0", "@babel/traverse@^7.1.0", "@babel/traverse@^7.4.3", "@babel/traverse@^7.4.4", "@babel/traverse@^7.5.5", "@babel/traverse@^7.6.2":
   version "7.6.2"
   resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.6.2.tgz#b0e2bfd401d339ce0e6c05690206d1e11502ce2c"
@@ -767,6 +838,21 @@
     globals "^11.1.0"
     lodash "^4.17.13"
 
+"@babel/traverse@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.7.4.tgz#9c1e7c60fb679fe4fcfaa42500833333c2058558"
+  integrity sha512-P1L58hQyupn8+ezVA2z5KBm4/Zr4lCC8dwKCMYzsa5jFMDMQAzaBNy9W5VjB+KAmBjb40U7a/H6ao+Xo+9saIw==
+  dependencies:
+    "@babel/code-frame" "^7.5.5"
+    "@babel/generator" "^7.7.4"
+    "@babel/helper-function-name" "^7.7.4"
+    "@babel/helper-split-export-declaration" "^7.7.4"
+    "@babel/parser" "^7.7.4"
+    "@babel/types" "^7.7.4"
+    debug "^4.1.0"
+    globals "^11.1.0"
+    lodash "^4.17.13"
+
 "@babel/types@^7.0.0", "@babel/types@^7.2.0", "@babel/types@^7.3.0", "@babel/types@^7.4.0", "@babel/types@^7.4.4", "@babel/types@^7.5.5", "@babel/types@^7.6.0":
   version "7.6.1"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.6.1.tgz#53abf3308add3ac2a2884d539151c57c4b3ac648"
@@ -776,6 +862,15 @@
     lodash "^4.17.13"
     to-fast-properties "^2.0.0"
 
+"@babel/types@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.7.4.tgz#516570d539e44ddf308c07569c258ff94fde9193"
+  integrity sha512-cz5Ji23KCi4T+YIE/BolWosrJuSmoZeN1EFnRtBwF+KKLi8GG/Z2c2hOJJeCXPk4mwk4QFvTmwIodJowXgttRA==
+  dependencies:
+    esutils "^2.0.2"
+    lodash "^4.17.13"
+    to-fast-properties "^2.0.0"
+
 "@cnakazawa/watch@^1.0.3":
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/@cnakazawa/watch/-/watch-1.0.3.tgz#099139eaec7ebf07a27c1786a3ff64f39464d2ef"