Bump dateformat from 4.5.1 to 5.0.2 (#287)

Bumps [dateformat](https://github.com/felixge/node-dateformat) from 4.6.3 to 5.0.2.
- [Release notes](https://github.com/felixge/node-dateformat/releases)
- [Commits](https://github.com/felixge/node-dateformat/commits/v5.0.2)

---
updated-dependencies:
- dependency-name: dateformat
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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package.json

@@ -19,7 +19,7 @@
     "@tippyjs/react": "^4.2.5",
     "babel-polyfill": "^6.26.0",
     "browser-encrypt-attachment": "^0.3.0",
-    "dateformat": "^4.5.1",
+    "dateformat": "^5.0.2",
     "emojibase-data": "^6.2.0",
     "file-saver": "^2.0.5",
     "flux": "^4.0.3",