fix multiple cmds syntax

Author: timoweiss

.travis.yml

@@ -8,8 +8,8 @@ node_js:
 sudo: required
 
 before_install:
-  chmod +x ./travis_before_install.sh
-  /bin/bash ./travis_before_install.sh
+  - chmod +x ./travis_before_install.sh
+  - /bin/bash ./travis_before_install.sh
 
 after_success:
   npm run coveralls