adds Codecov badge to readme. fixes https://github.com/dwyl/learn-tdd/issues/39 #FTW!
adds Codecov badge to readme. fixes https://github.com/dwyl/learn-tdd/issues/39 #FTW!

nelsonic/learn-tdd,dwyl/learn-tdd,nelsonic/learn-tdd,dwyl/learn-tdd