Check for null on file system changes.
Recognize mentions in comments.
Merge branch 'feature/github-mentions'
Merge branch 'bug/expanded-state'
Fix issue with expanded state on startup.
Save the regular expressions of tags.
Use forEach for marking invalid fields.
Update changelog with ukrainian translation.
Store expanded state in local storage.
Store hidden tags in local storage.
Merge branch 'refactor/localstorage-preferences'
No need to remove entries from expanded state.
Remove unused preferences.
GitHub user names may contain dash.
Allow enable/disable sorting tasks by done state.

Resolves #60.
Placeholder for strings in translations.
Swedish translation of new strings.
Update change log with new features.
Note about sorting of done tasks.
Note about GitHub mentions and issues.