Bump date-fns from 2.4.1 to 2.8.1 (#64)

Bumps [date-fns](https://github.com/date-fns/date-fns) from 2.4.1 to 2.8.1.
- [Release notes](https://github.com/date-fns/date-fns/releases)
- [Changelog](https://github.com/date-fns/date-fns/blob/master/CHANGELOG.md)
- [Commits](https://github.com/date-fns/date-fns/compare/v2.4.1...v2.8.1)

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

package.json

@@ -19,7 +19,7 @@
     "@babel/polyfill": "^7.7.0",
     "axios": "^0.19.0",
     "classnames": "^2.2.6",
-    "date-fns": "^2.2.1",
+    "date-fns": "^2.8.1",
     "dotenv": "^8.2.0",
     "lodash": "^4.17.11",
     "mobx": "^5.15.1",