Add au3 and cmd to extension mapping, temporary fix

Author: p0358

CodeStats/Resources/extension_mapping.json

@@ -2,11 +2,13 @@
   "plaintext": "Plain text",
   "txt": "Plain text",
   "log": "Log",
+  "au3": "AutoIt",
   "bat": "Batch",
   "clojure": "Clojure",
   "coffeescript": "CoffeeScript",
   "coffee": "CoffeeScript",
   "c": "C",
+  "cmd": "Batch",
   "cpp": "C++",
   "hpp": "C++",
   "csharp": "C#",