Update README.md

Add CI and coverage Badges

README.md

@@ -1,6 +1,8 @@
 Library pool
 ============
 
+[![Build Status](https://semaphoreci.com/api/v1/projects/a85ae32e-f437-40f1-9652-2525ec282658/593594/badge.svg)](https://semaphoreci.com/joeybloggs/pool)
+[![Coverage Status](https://coveralls.io/repos/go-playground/pool/badge.svg?branch=v1&service=github)](https://coveralls.io/github/go-playground/pool?branch=v1)
 [![GoDoc](https://godoc.org/gopkg.in/go-playground/pool.v1?status.svg)](https://godoc.org/gopkg.in/go-playground/pool.v1)
 
 Library pool implements a consumer goroutine pool for easier goroutine handling. 
@@ -181,4 +183,4 @@ v1 and v1-development branch however, there will also be a v2-development branch
 
 License
 ------
-Distributed under MIT License, please see license file in code for more details.
+Distributed under MIT License, please see license file in code for more details.