tweaked README to include accepts_nested_attributes_for mention
tweaked README to include accepts_nested_attributes_for mention

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