fix build configurations

.travis.yml

@@ -5,9 +5,7 @@ os:
 language: node_js
 node_js:
   - node
-  - iojs
+  - '10'
   - '8'
-  - '7'
   - '6'
-  - '5'
   - '4'

README.md

@@ -1,4 +1,4 @@
-# helper-resolve [![NPM version](https://img.shields.io/npm/v/helper-resolve.svg?style=flat)](https://www.npmjs.com/package/helper-resolve) [![NPM monthly downloads](https://img.shields.io/npm/dm/helper-resolve.svg?style=flat)](https://npmjs.org/package/helper-resolve)  [![NPM total downloads](https://img.shields.io/npm/dt/helper-resolve.svg?style=flat)](https://npmjs.org/package/helper-resolve) [![Linux Build Status](https://img.shields.io/travis/helpers/helper-resolve.svg?style=flat&label=Travis)](https://travis-ci.org/helpers/helper-resolve) [![Windows Build Status](https://img.shields.io/appveyor/ci/helpers/helper-resolve.svg?style=flat&label=AppVeyor)](https://ci.appveyor.com/project/helpers/helper-resolve)
+# helper-resolve [![NPM version](https://img.shields.io/npm/v/helper-resolve.svg?style=flat)](https://www.npmjs.com/package/helper-resolve) [![NPM monthly downloads](https://img.shields.io/npm/dm/helper-resolve.svg?style=flat)](https://npmjs.org/package/helper-resolve)  [![NPM total downloads](https://img.shields.io/npm/dt/helper-resolve.svg?style=flat)](https://npmjs.org/package/helper-resolve) [![Linux Build Status](https://img.shields.io/travis/helpers/helper-resolve.svg?style=flat&label=Travis)](https://travis-ci.org/helpers/helper-resolve)
 
 > Templates helper to resolve the path to a file in node_modules. This is mostly useful during development.