Add links to docs (#29)

* Add links to docs

Fixes #8

* Update README.md

bare urls ftl

README.md

@@ -2,9 +2,15 @@
 
 [![Codeship Status for codeship/codeship-go](https://app.codeship.com/projects/c38f3280-792b-0135-21bb-4e0cf8ff365b/status?branch=master)](https://app.codeship.com/projects/244943)
 [![MIT License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE)
+[![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](http://godoc.org/github.com/codeship/codeship-go)
+[![Go Report Card](https://goreportcard.com/badge/github.com/codeship/codeship-go?style=flat-square)](https://goreportcard.com/report/github.com/codeship/codeship-go)
 
 Codeship [API v2](https://apidocs.codeship.com/v2) client for Golang
 
+## Documentation
+
+[https://godoc.org/github.com/codeship/codeship-go](https://godoc.org/github.com/codeship/codeship-go)
+
 ## Usage
 
 `go get -u github.com/codeship/codeship-go`
@@ -104,10 +110,6 @@ var (
 client, err := codeship.New(auth, codeship.Verbose(true), codeship.Logger(logger))
 ```
 
-## Documentation
-
-TODO: link to GoDoc
-
 ## Contributing
 
 This project follows Codeship's [Go best practices](https://github.com/codeship/go-best-practices). Please review them and make sure your PR follows the guidelines laid out before submitting.