Remove node 0.10 from CI

Author: Andrey Kuzmin

.travis.yml

@@ -1,7 +1,7 @@
 sudo: false
 language: node_js
 node_js:
-  - iojs
-  - "stable"
-  - "0.12"
-  - "0.10"
+  - stable
+  - 6
+  - 4
+  - 0.12

package.json

@@ -29,7 +29,6 @@
     "vinyl-sourcemaps-apply": "^0.2.1"
   },
   "devDependencies": {
-    "es6-promise": "^3.3.1",
     "gulp-sourcemaps": "^1.11.0",
     "mocha": "^3.2.0",
     "proxyquire": "^1.7.4",

test.js

@@ -1,6 +1,5 @@
 /* global it, afterEach, beforeEach, describe, Promise */
 
-require('es6-promise').polyfill()
 var assert = require('assert')
 var gutil = require('gulp-util')
 var sourceMaps = require('gulp-sourcemaps')