use latest firefox version on travis

maxgalbu · maxgalbu · commit 951fb826926d · 2017-06-29T16:34:44.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,9 @@
 sudo: false
 language: node_js
 
+addons:
+  firefox: latest
+
 env:
   - NIGHTWATCH_ENV=
   - NIGHTWATCH_ENV=chrome
