fix: upgrade date-fns from 2.15.0 to 2.16.0 (#137)

Snyk has created this PR to upgrade date-fns from 2.15.0 to 2.16.0.

See this package in npm:
https://www.npmjs.com/package/date-fns

See this project in Snyk:
https://app.snyk.io/org/johanneskonings/project/b30410ce-f052-409e-904e-a2e4798c61db?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -16,7 +16,7 @@
     "aws-amplify": "^3.0.24",
     "chartist": "0.11.4",
     "classnames": "2.2.6",
-    "date-fns": "^2.14.0",
+    "date-fns": "^2.16.0",
     "history": "4.10.1",
     "notistack": "^0.9.16",
     "perfect-scrollbar": "1.5.0",