Auto merge of #740 - glennw:rev-update, r=larsbergstrom

Add Gankro to WR reviewers list.

Some reviews in WR that Gankro has worked on:

servo/webrender#1830
servo/webrender#1799
servo/webrender#1834
servo/webrender#1664

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/saltfs/740)
<!-- Reviewable:end -->

homu/files/cfg.toml

@@ -84,7 +84,7 @@ secret = "{{ secrets['web-secret'] }}"
     },
     "unicode-script": {},
     "webrender": {
-        "extra_reviewers": [ "nical", "jrmuizel" ],
+        "extra_reviewers": [ "nical", "jrmuizel", "Gankro" ],
     },
     "webrender_traits": {},
 } %}