corrected travis.yml

Author: Hirzelts

.travis.yml

@@ -7,12 +7,8 @@ addons:
 cache:
  directories:
    - "node_modules"
-before_install:
-   - npm install -g grunt-cli
 install:
    - npm install
-before_script:
-  - grunt build
 script:
   - npm test
   - sonar-scanner