Update readme to include bootstrap-sprockets
Update readme to include bootstrap-sprockets

BDNelson123/bootstrap3-datetimepicker-rails,graysonwright/datetime_picker_rails,graysonwright/datetime_picker_rails,TrevorS/bootstrap3-datetimepicker-rails,niiicolai/bootstrap3-datetimepicker-rails,sopheak-se/bootstrap3-datetimepicker-rails,truotaku/bootstrap3-datetimepicker-rails,variousauthors/bootstrap3-datetimepicker-rails