Merge pull request #30 from ipfs/remove-old-build-systems

chore: remove old build systems

Author: achingbrain

.travis.yml

@@ -9,7 +9,7 @@
 [![Dependency Status](https://david-dm.org/ipfs/js-ipfs-unixfs.svg?style=flat-square)](https://david-dm.org/ipfs/js-ipfs-unixfs)
 [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/feross/standard)
 ![](https://img.shields.io/badge/npm-%3E%3D3.0.0-orange.svg?style=flat-square)
-![](https://img.shields.io/badge/Node.js-%3E%3D4.0.0-orange.svg?style=flat-square)
+![](https://img.shields.io/badge/Node.js-%3E%3D8.0.0-orange.svg?style=flat-square)
 
 > JavaScript implementation of IPFS' unixfs (a Unix FileSystem representation on top of a MerkleDAG)