chore: drop support for Node.js 0.10

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

.travis.yml

@@ -1,13 +1,11 @@
 language: node_js
 node_js:
-  - "0.10"
-  - "0.12"
-  - "1"
-  - "2"
-  - "3"
-  - "4"
-  - "5"
-  - "node"
+  - '1'
+  - '2'
+  - '3'
+  - '4'
+  - '5'
+  - node
 after_success:
   - node_modules/.bin/babel tests/tests.js --out-file tests/tests-es5.js
   - node_modules/.bin/istanbul cover node_modules/.bin/_mocha tests/index.js