Bug 1348801 - bump eslint to fix orange a=tomcat r=Standard8

--HG--
extra : rebase_source : 98fd635ec9ac0e64142ea6440d58dbb43fa8963a

browser/.eslintrc.js

@@ -8,7 +8,7 @@ module.exports = {
   "rules": {
     // XXX Bug 1326071 - This should be reduced down - probably to 20 or to
     // be removed & synced with the mozilla/recommended value.
-    "complexity": ["error", {"max": 40}],
+    "complexity": ["error", {"max": 42}],
 
     "no-shadow": "error",
   }