chore(travis): whitelist greenkeeper branches

greenkeeper[bot] · greenkeeper[bot] · commit b026af16a70b · 2018-04-10T14:50:43.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -14,6 +14,7 @@ git:
 branches:
   only: 
     - master
+    - /^greenkeeper/.*$/
 
 before_script:
   - bash ci/commit-lockfile.sh
