(cake-contribGH-597) Add ability to select pre-release or stable rele…

…ase notes

This allows an argument called 'create-pre-release'
to be used when calling the cake build script for
specifically setting the milestone to the generated
SemVer version, instead of a stable version.
On tagged releases this should always be
the SemVer version no matter what is used.

Cake.Recipe/Content/gitreleasemanager.cake

@@ -11,8 +11,12 @@ BuildParameters.Tasks.CreateReleaseNotesTask = Task("Create-Release-Notes")
  Milestone = buildVersion.Milestone,
  Name = buildVersion.Milestone,
  TargetCommitish = BuildParameters.MasterBranchName,
- Prerelease = false
+ Prerelease = context.HasArgument("create-pre-release")
  };
+ if (settings.Prerelease)
+ {
+ settings.TargetCommitish = BuildParameters.BuildProvider.Repository.Branch;
+ }
 
  if (!string.IsNullOrEmpty(BuildParameters.GitHub.Token))
  {

Cake.Recipe/Content/gitversion.cake

@@ -118,7 +118,7 @@ public class BuildVersion
  {
  Version = version,
  SemVersion = semVersion?.ToLowerInvariant(),
- Milestone = milestone,
+ Milestone = BuildParameters.IsTagged || context.HasArgument("create-pre-release") ? milestone : version,
  CakeVersion = cakeVersion,
  InformationalVersion = informationalVersion?.ToLowerInvariant(),
  FullSemVersion = fullSemVersion?.ToLowerInvariant(),