organize travis.yml config

Author: abranhe

.travis.yml

@@ -2,9 +2,13 @@ language: node_js
 node_js:
  - "9"
 
-before_script: npm version && install
+before_script: 
+ - npm version
+ - cd scripts/
+ - npm install
 
-script: cd scripts && npm run validate
+script:
+ - npm run validate
 
 notifications:
  email: false