v0.31

Resizing browser window now works correctly and it's possible to configure if alerts are initially collapsed or
expanded.

Full changelog:

• #599 fix(ui): ensure that filter input labels are truncated if too long
• #597 chore(ci): use Go 1.12.2 on Travis
• #594 fix(ui): cleanup filter input css classes
• #589 fix(ui): repack alert grid on font load
• #582 fix(ui): redraw alert grid on orientation changes
• #579 fix(ui): reset grid after browser reset
• #578 feat(ui): allow configuring default collapse state for alert groups
• #576 feat(ui): show progress indicators for silence form matchers
• #571 feat(ui): collapse alert groups on mobile by default
• #567 chore(ui): upgrade all 3rd party dependencies
• #561 refactor(ui): add background color to the alert group title
• #556 fix(ui): use flex for ordering filter elements
• #558 fix(ci): run go mod tidy when linting go.mod
• #550 feat(ui): hide filter counter value when not needed
• #547 chore(github): don't limit probot/stale to only issues
• #546 feat(renovate): let renovate bot merge dev and patch PRs
• #544 chore(ui): upgrade all 3rd party dependencies