Add travis tests

Author: kunall17

.travis.yml

@@ -0,0 +1,16 @@
+language: node_js
+
+node_js:
+  - 8
+
+cache:
+  yarn: true
+  directories:
+    - node_modules
+
+install:
+  - npm i yarn -g
+  - yarn
+
+script:
+  - yarn test