Puts tree in release mode for -rc1.

version/version_base.go

@@ -12,5 +12,5 @@ func init() {
 	// A pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release
 	// such as "dev" (in development), "beta", "rc1", etc.
-	VersionPrerelease = "dev"
+	VersionPrerelease = "rc1"
 }