feat(github-code-colors): support gist.github.com (#168)

test: https://gist.github.com/s1n7ax/3d2b476ecbde72693572b8652044e5a4

Author: cutbypham

github-code-colors.user.js

@@ -1,11 +1,11 @@
 // ==UserScript==
 // @name        GitHub Code Colors
-// @version     2.0.6
+// @version     2.0.7
 // @description A userscript that adds a color swatch next to the code color definition
 // @license     MIT
 // @author      Rob Garrison
 // @namespace   https://github.com/Mottie
-// @include     https://github.com/*
+// @include     https://*.github.com/*
 // @run-at      document-idle
 // @grant       GM.addStyle
 // @grant       GM_addStyle
@@ -276,4 +276,4 @@
 	document.addEventListener("keyup", checkPopup);
 	addColors();
 
-})();
+})();