Bump prettier from 1.18.2 to 1.19.1 (#51)

Bumps [prettier](https://github.com/prettier/prettier) from 1.18.2 to 1.19.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/1.18.2...1.19.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -57,7 +57,7 @@
     "jest": "^24.1.0",
     "mini-css-extract-plugin": "^0.8.0",
     "node-sass": "^4.13.0",
-    "prettier": "^1.16.4",
+    "prettier": "^1.19.1",
     "sass-loader": "^8.0.0",
     "style-loader": "^1.0.1",
     "svg-inline-loader": "^0.8.0",