Added Travis CI

Author: coderdiaz

Diff for: .travis.yml

@@ -0,0 +1,12 @@
+language: node_js
+node_js:
+  - "8"
+  - "9"
+cache:
+  yarn: true
+  directories:
+    - node_modules
+install:
+  - yarn install
+script:
+  - yarn run test