fix publish on tags.

Author: Dan Walmsley

build.cake

@@ -286,8 +286,7 @@ Task("Publish-MyGet")
     .WithCriteria(() => !isLocalBuild)
     .WithCriteria(() => !isPullRequest)
     .WithCriteria(() => isMainRepo)
-    .WithCriteria(() => isMasterBranch)    
-    .WithCriteria(()=> isReleasable)
+    .WithCriteria(() => isMasterBranch)
     .WithCriteria(()=> isRunningOnAppVeyor)
     .WithCriteria(()=> isTagged)
     .Does(() =>