Update Node.js versions to latest list (> 4)

Remove old notification and allow_failures settings

Author: BigBlueHat

.travis.yml

@@ -1,22 +1,14 @@
 sudo: false
 language: node_js
 node_js:
-  - "0.10"
-  - "0.12"
-  - "4.1"
+  - "4"
+  - "5"
+  - "6"
+  - "7"
 
 before_install:
   - travis_retry npm install -g [email protected]
   - travis_retry npm install
 
 script:
   - npm test
-
-matrix:
-  allow_failures:
-    - node_js: "0.10"
-
-notifications:
-  email:
-    - [email protected]
-  irc: "irc.freenode.org#nodejitsu"