fixed yml

Author: hawx1993

.travis.yml

@@ -1,8 +1,12 @@
 language: node_js
-sudo: false
+sudo: required
 node_js:
-  - '4.4'
-
+  - "0.12"
+install:
+  - npm install
 branches:
   only:
     - master
+cache:
+  directories:
+    - node_modules