Updated github regex to ignore internal Discord references.

triggers/github.js

@@ -1,7 +1,7 @@
 var app = require('../app.js');
 var logger = require('../logging.js');
 
-var regex = /\#\d+./;
+var regex = /[^\<]\#\d+[^\>]/;
 
 exports.trigger = function(message) {
   return regex.test(message.content);