[release-v2.0] release: Bump for 2.0.0.

This clears the PreRelease and sets the BuildMetadata to release.local
on the release branch so that anyone building the release branch will
end up with version "2.0.0+release.local" indicating it was a local
build as opposed to a release build.

version.go

@@ -67,7 +67,7 @@ var (
 	// the app will panic at runtime.  Of particular note is the pre-release
 	// and build metadata portions MUST only contain characters from
 	// semanticAlphabet.
-	Version = "2.0.0-pre"
+	Version = "2.0.0+release.local"
 
 	// NOTE: The following values are set via init by parsing the above Version
 	// string.