Update .travis.yml

updated node_js versions, included cache directory node_modules and commented out npm run react-cli

Author: endormi

.travis.yml

@@ -1,14 +1,19 @@
 language: node_js
 
 node_js:
-  - 10
-  - 9
-  - 8
+  - 'node'
+  - '6'
+  - '8'
+  - '10'
 
-install: npm install
+cache:
+  directories:
+    - node_modules
+
+install: npm i
 
 script:
-  - npm run react-cli && echo -e "\n\n\n"
+#  - npm run react-cli && echo -e "\n\n\n"
   - npm run test && echo -e "\n\n\n"
 
 after_success: echo "Success"