Added a require sudo line to the travis script

.travis.yml

@@ -8,6 +8,8 @@ node_js:
 services:
   - docker
 
+sudo: required
+
 before_install:
   # If ever run on windows make sure you don't run this in the git bash!
   - docker run -dit --name emscripten -v "$(pwd)":"/src/" trzeci/emscripten:sdk-incoming-64bit bash