chore: ci

Author: Sven

.travis.yml

@@ -1,14 +1,14 @@
 sudo: false
+dist: trusty
 language: node_js
 node_js:
   - "6"
 
 cache:
-  yarn: true
   directories:
     - node_modules
 
 script:
-  - yarn lint
-  - yarn build
+  - npm run lint
+  - npm run build