Merge pull request OmniSharp#2065 from OmniSharp/feature/releasenotes

updated changelog for release 1.37.6

Merge pull request OmniSharp#2043 from JoeRobich/update-changelog

Update changelog for 1.37.5

Merge pull request OmniSharp#2021 from OmniSharp/release-notes-novemb…

…er-2020

release notes november 2020

Merge pull request OmniSharp#1985 from OmniSharp/update-changelog1

Update changelog for release

Merge pull request OmniSharp#1978 from OmniSharp/release-notes

final changelog update for the release

Merge pull request OmniSharp#1927 from JoeRobich/update-roslyn-3.8.0-3

Update Roslyn to 3.8.0-3.20451.2

Merge pull request OmniSharp#1897 from JoeRobich/update-roslyn

Update Roslyn version and tooling to better match NET 5 Preview8

Merge pull request OmniSharp#1886 from OmniSharp/update-changelog

Update changelog for 1.36.1 release

Update CHANGELOG.md (OmniSharp#1879)

Merge pull request OmniSharp#1857 from JoeRobich/get-dotnetinfo-once

Only request dotnet info once for the solution or directory