Autolinker: Improved URL regex (#1842)

This changes the regex for matching URLs to include the `@` character and improves the pattern to avoid backtracking.

Author: RunDevelopment

plugins/autolinker/prism-autolinker.js

@@ -7,7 +7,7 @@ if (
 	return;
 }
 
-var url = /\b([a-z]{3,7}:\/\/|tel:)[\w\-+%~/.:=&]+(?:\?[\w\-+%~/.:#=?&!$'()*,;]*)?(?:#[\w\-+%~/.:#=?&!$'()*,;]*)?/,
+var url = /\b([a-z]{3,7}:\/\/|tel:)[\w\-+%~/.:=&@]+(?:\?[\w\-+%~/.:=?&!$'()*,;@]*)?(?:#[\w\-+%~/.:#=?&!$'()*,;@]*)?/,
     email = /\b\S+@[\w.]+[a-z]{2}/,
     linkMd = /\[([^\]]+)]\(([^)]+)\)/,