Py3_mercurial 6.5.3 => 6.7.3 (#9940)

Add hg fake package for mercurial

packages/hg.rb

@@ -0,0 +1,14 @@
+require 'package'
+require_relative 'py3_mercurial'
+
+class Hg < Package
+  description Py3_mercurial.description
+  homepage Py3_mercurial.homepage
+  version Py3_mercurial.version
+  license Py3_mercurial.license
+  compatibility Py3_mercurial.compatibility
+
+  is_fake
+
+  depends_on 'py3_mercurial'
+end