added twitter to gem install welcome note
added twitter to gem install welcome note

ConferenceCloud/formtastic,thenthen8515/formtastic,Guestfolio/formtastic,mikz/formtastic,Guestfolio/formtastic,Baltazore/formtastic,nishaya/formtastic,ryanfox1985/formtastic,nishaya/formtastic,EndingChaung/formtastic,justinfrench/formtastic,EndingChaung/formtastic,paulodiovani/formtastic,ryanfox1985/formtastic,justinfrench/formtastic,sideci-sample/sideci-sample-formtastic,Davidzhu001/formtastic,Davidzhu001/formtastic,justinfrench/formtastic,mikz/formtastic,paulodiovani/formtastic,ryanfox1985/formtastic,ConferenceCloud/formtastic,thenthen8515/formtastic,crashlytics/formtastic