updated README
updated README

tzi/calendar,nicholasleblanc/calendar,theodorejb/calendar,theodorejb/calendar,Magicline/calendar,KonishiLee/calendar,tzi/calendar,danieljacobarcher/calendar,FelixZhang00/calendar,Baremetrics/calendar,attribution/calendar,FelixZhang00/calendar,KonishiLee/calendar,nicholasleblanc/calendar,Baremetrics/calendar,Magicline/calendar,danieljacobarcher/calendar,attribution/calendar