A couple little fixes for MaptimeMSP

Removed "coming soon" (just had our first meetup — we're totally a thing now). Also fixed the @@ issue with our twitter handles on the maptime.io chapters page. Finally, updated our meetup link because we changed it (removed the dash between "Maptime" and "MSP").
Merge pull request #120 from mtaylorlong/patch-2

A couple little fixes for MaptimeMSP