adds raleigh-durham chapter (papers-we-love#430)

Author: jbelmont

README.md

@@ -35,6 +35,7 @@ Here are our official chapters. Let us know if you are interested in [starting o
 * [Philadelphia](http://www.meetup.com/Papers-We-Love-Philadelphia/)
 * [Portland](http://www.meetup.com/Papers-We-Love-PDX/)
 * [Pune](http://www.meetup.com/Doo-Things)
+* [Raleigh-Durham](https://www.meetup.com/Papers-We-Love-Raleigh-Durham/)
 * [Reykjavík](http://www.meetup.com/Papers-We-Love-Reykjavik)
 * [San Diego](http://www.meetup.com/Papers-We-Love-San-Diego/)
 * [San Francisco](http://www.meetup.com/papers-we-love-too/)