fix: upgrade aws-amplify from 2.2.6 to 2.2.7 (#28)

Snyk has created this PR to upgrade aws-amplify from 2.2.6 to 2.2.7.

See this package in NPM:
https://www.npmjs.com/package/aws-amplify

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

@@ -9,7 +9,7 @@
     "@material-ui/core": "4.9.7",
     "@material-ui/icons": "4.9.1",
     "@material-ui/pickers": "^3.2.10",
-    "aws-amplify": "2.2.6",
+    "aws-amplify": "2.2.7",
     "aws-amplify-react": "3.1.7",
     "chartist": "0.11.4",
     "classnames": "2.2.6",