Added a mention of CocoaPods to the README.
Added a mention of CocoaPods to the README.

mclazarus/MBCalendarKit,glentregoning/MBCalendarKit,tiger8888/MBCalendarKit,glentregoning/MBCalendarKit,mattjustiss/MBCalendarKit,mclazarus/MBCalendarKit,jameswhiteman/CalendarFix,mattjustiss/MBCalendarKit,tiger8888/MBCalendarKit,mclazarus/MBCalendarKit,mattjustiss/MBCalendarKit,tiger8888/MBCalendarKit,glentregoning/MBCalendarKit,glentregoning/MBCalendarKit,mclazarus/MBCalendarKit,mattjustiss/MBCalendarKit,jameswhiteman/CalendarFix,jameswhiteman/CalendarFix