Update badges links

Author: yaacov

README.md

@@ -1,9 +1,9 @@
 # Prometheus API Ruby Client
 
 [![Gem Version][1]](http://badge.fury.io/rb/prometheus-api-client)
-[![Build Status][2]](http://travis-ci.org/yaacov/prometheus_api_client_ruby)
-[![Build Status][3]](https://codeclimate.com/github/yaacov/prometheus_api_client_ruby)
-[![Coverage Status][4]](https://coveralls.io/github/yaacov/prometheus_api_client_ruby?branch=master)
+[![Build Status][2]](http://travis-ci.org/prometheus/prometheus_api_client_ruby)
+[![Build Status][3]](https://codeclimate.com/github/prometheus/prometheus_api_client_ruby)
+[![Coverage Status][4]](https://coveralls.io/github/prometheus/prometheus_api_client_ruby?branch=master)
 
 A Ruby library for reading metrics stored on a Prometheus server.