Allow VersionEntry.sha256 to be null (mozilla#1298)

Recreate the content DOM node on location changes (mozilla#1253)

Update dependency prettier to v1.19.1 (mozilla#1225)

* Update dependency prettier to v1.19.1

* apply prettier

Increase specificity to make gray buttons gray (mozilla#1199)

Add Navbar actions to summarize all comments (mozilla#1170)

Update dependency @types/react to v16.9.6 (mozilla#1129)

Render saved comments in Browse mode (mozilla#1102)

Adjust comments state to prep for loading API data (mozilla#1083)

Update dependency react-scripts to v3.1.2 (mozilla#1067)