5.16.0-alpha.1228

LEGACY: Remove Fake.Deploy from repository and NuGet package, see #1820
LEGACY: Update to net461 to support latest FSharp.Compiler.Service to fix #2362
LEGACY: Release a new version of FakeLib.dll (the original FAKE NuGet package)
BUGFIX: Fake.Api.Slack uses Username not From, thanks @mastion - #2360
ENHANCEMENT: add rollforward policy to next-major to make fake-cli work in future dotnet sdk major version, thanks @baronfel - #2372
ENHANCEMENT: ProcessUtils now considers PATHEXT on windows - #2368
ENHANCEMENT: [Fake.Api.GitHub] Added TargetCommitish parameter to the CreateReleaseParams record. This parameter is passed to Octokit's 'NewRelease', and allows for the creation of releases from arbitrary commits when the release tag does not exist yet, thanks @nikolamilekic - #2367
(Minor) BREAKING: Drop support for netstandard1.6 and net46 (please open an issue if that actually hits you). All fake modules are now compiled for netstandard2.0, net462 and FSharp.Core 4.7, you should consider to upgrade your runtime.
ENHANCEMENT: Fake.DotNet.Fsc and Fake.DotNet.Fsi now use latest FSharp.Compiler.Service