Treat .inc/.phpt files like php

Author: TysonAndre

git-diff-syntax-highlight.rb

@@ -104,6 +104,8 @@ def triple(num)
   'json' => :json,
   'php' => :php,
   'html' => :php,
+  'inc' => :php,
+  'phpt' => :php,
   'lua' => :lua,
   'py' => :python,
   'sass' => :sass,