chore: drop support for Node.js 0.10

BREAKING CHANGE: This module no longer supports Node.js 0.10

.travis.yml

@@ -1,8 +1,5 @@
 language: node_js
 node_js:
-  - 0.8
-  - '0.10'
-  - 0.12
   - 4
 before_install:
   - npm install -g npm@2.x