Using sudo as workaround for shellscape/mocha-chrome#21

Author: blueimp

.travis.yml

@@ -1,6 +1,9 @@
 dist: trusty
 addons:
   chrome: stable
+# Using sudo as workaround for
+# https://github.com/shellscape/mocha-chrome/pull/21
+sudo: required
 language: node_js
 node_js:
   - "stable"