Syntax highlight .arclint files as JSON.

Summary: After T2039, it makes sense to syntax highlight `.arclint` files as JSON.

Test Plan: N/A

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9305

Author: joshuaspence

conf/default.conf.php

@@ -1035,6 +1035,7 @@
     // '@\\.([^.]+)\\.bak$@' => 1,
 
     '@\.arcconfig$@' => 'js',
+    '@\.arclint$@' => 'js',
     '@\.divinerconfig$@' => 'js',
   ),
 

src/applications/config/option/PhabricatorSyntaxHighlightingConfigOptions.php

@@ -77,6 +77,7 @@ public function getOptions() {
         'wild',
         array(
           '@\.arcconfig$@' => 'js',
+          '@\.arclint$@' => 'js',
           '@\.divinerconfig$@' => 'js',
         ))
         ->setSummary(