Update README.md

Letting others know that the gem is broken.

Author: jkhaykin

README.md

@@ -2,6 +2,8 @@ PossibleEmail
 =========
 A Ruby Gem to find someone's possible email address using their first name, last name, and domain.
 
+** NOTE: Rapportive recently changed their API which has broken the functionality of this gem. If you already know where the bug is or have time to fix it, send a pull request. **
+
 [![Gem Version](https://badge.fury.io/rb/possible_email.svg)](http://badge.fury.io/rb/possible_email)
 [![Build Status](https://travis-ci.org/the4dpatrick/possible-email.svg?branch=master)](https://travis-ci.org/the4dpatrick/possible-email)
 [![Coverage Status](https://coveralls.io/repos/the4dpatrick/possible-email/badge.png?branch=master)](https://coveralls.io/r/the4dpatrick/possible-email?branch=master)