Merge pull request #2549 from github/fixes/2547-pr-preview-broken

Update Octokit.GraphQL schema

Merge pull request #2512 from davidwengier/FixDiffCaptions

Prevent error when filenames have braces in them

Merge pull request #2460 from github/azure-pipelines/certificate-sha1

Sign the VSIX

Merge pull request #2482 from github/fixes/2481-PullRequest.timelineI…

…tems

Use PullRequest.timelineItems instead of PullRequest.timeline

Merge pull request #2462 from github/fixes/2455-request-workflow-scope

Request the `workflow` scope

Add design time resources for font scaling

Add scaling styles for built in Labels and TextBlocks on Visual Studio 2015 and up.

Merge pull request #2156 from github/autocompletebox

Migrating and Updating AutoCompleteBox from *original* GitHub Desktop for Windows

Properly bumping to 2.8.1

Merge pull request #1968 from github/l10n_master

New Crowdin translations

Merge fde4693 into 337f266