Get CI working.

* Enable travis
* Enable codecov

fix #4

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

.travis.yml

+sudo: false
+
+
+language: go
+go:
+  - 'tip'
+  
+install:
+  - go get github.com/whyrusleeping/gx
+  - go get github.com/whyrusleeping/gx-go
+  - gx install --global
+script:
+  - gx test -v -race -coverprofile=coverage.txt -covermode=atomic .
+  
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
+
+cache:
+  directories:
+    - $GOPATH/src/gx
+
+notifications:
+email: false
+  

README.md

@@ -4,7 +4,7 @@ go-block-format
 [![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
 [![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
 [![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
-[![Coverage Status](https://coveralls.io/repos/github/ipfs/go-block-format/badge.svg?branch=master)](https://coveralls.io/github/ipfs/go-block-format?branch=master)
+[![Coverage Status](https://codecov.io/gh/ipfs/go-block-format/branch/master/graph/badge.svg)](https://codecov.io/gh/ipfs/go-block-format/branch/master)
 [![Travis CI](https://travis-ci.org/ipfs/go-block-format.svg?branch=master)](https://travis-ci.org/ipfs/go-block-format)
 
 > go-block-format is a set of interfaces that a type needs to implement in order to be a CID addressable block of data.

codecov.yml

+coverage:
+  range: "50...100"
+comment: off