fix .travis.yml

Author: abhishek97

.travis.yml

@@ -1,7 +1,7 @@
 dist: trusty
 
 language: node_js
- node_js: "stable"
+node_js: "stable"
 
 install:
     - yarn install
@@ -10,4 +10,4 @@ env:
   # add env variables here
 
 script:
-    - yarn run test
+    - yarn run test