Link to docs for newest API from master branch.

Author: ChrisHines

README.md

@@ -1,6 +1,4 @@
-[![GoDoc](https://godoc.org/github.com/go-stack/stack
-?status.svg)](https://godoc.org/github.com/go-stack/stack
-) [![Build Status](https://travis-ci.org/go-stack/stack.svg?branch=master)](https://travis-ci.org/go-stack/stack)
+[![GoDoc](https://godoc.org/gopkg.in/stack.v1?status.svg)](https://godoc.org/gopkg.in/stack.v1) [![Build Status](https://travis-ci.org/go-stack/stack.svg?branch=master)](https://travis-ci.org/go-stack/stack)
 
 # stack