blobaugh/Meetup-API-client-for-PHP — pull request #15 by wjgilmore (2013-10-21 16:58:27+00:00)
Title: Added topic to list of available required parameters

It is useful to search groups by topic, so I've added `topic` to the array of available required parameters. This is one of the supported parameters as defined here: http://www.meetup.com/meetup_api/docs/2/groups/.