fix: upgrade date-fns from 2.11.1 to 2.12.0 (#52)

Snyk has created this PR to upgrade date-fns from 2.11.1 to 2.12.0.

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

@@ -13,7 +13,7 @@
     "aws-amplify-react": "3.1.9",
     "chartist": "0.11.4",
     "classnames": "2.2.6",
-    "date-fns": "^2.11.1",
+    "date-fns": "^2.12.0",
     "history": "4.10.1",
     "notistack": "^0.9.9",
     "perfect-scrollbar": "1.5.0",