Add the class toggle binding to list of available bindings in the README.
Add the class toggle binding to list of available bindings in the README.

QAPInt/rivets,jccazeaux/rivets,zongkelong/rivets,moneyadviceservice/rivets,GerHobbelt/rivets,nopnop/rivets,GerHobbelt/rivets,MishaMykhalyuk/rivets,MishaMykhalyuk/rivets,mikeric/rivets,QAPInt/rivets,npmcomponent/mikeric-rivets,QAPInt/rivets,mikeric/rivets,jccazeaux/rivets,MishaMykhalyuk/rivets,altmind/rivets,nopnop/rivets,re-clone/rivets,zongkelong/rivets,kangax/rivets,benderTheCrime/tiny-rivets,re-clone/rivets,GerHobbelt/rivets,altmind/rivets,nopnop/rivets,re-clone/rivets,mikeric/rivets,zongkelong/rivets,altmind/rivets,jccazeaux/rivets