chore: drop support for Node.js 0.10 (#715)

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

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
- - "0.10"
+ - 6
 before_script: make dev
 script: make check
 sudo: false