Add GoDoc readme reference

Author: heraclmene

README.md

@@ -1,6 +1,7 @@
 # go-selenium
 
 [![Build Status](https://travis-ci.org/BunsenApp/go-selenium.svg?branch=master)](https://travis-ci.org/BunsenApp/go-selenium)
+[![GoDoc](https://godoc.org/github.com/BunsenApp/go-selenium?status.svg)](https://godoc.org/github.com/BunsenApp/go-selenium)
 
 This project is still currently under development and is not ready for any use
 other than to see how it is progressing. Further documentation will be added