Improve messaging in README file
Improve messaging in README file

beddari/calico,anortef/calico,ocadotechnology/calico,neiljerram/felix,anortef/calico,kasisnu/calico,alexhersh/calico,matthewdupre/felix,beddari/calico,kasisnu/calico,TrimBiggs/calico,neiljerram/felix,Metaswitch/calico,neiljerram/felix,neiljerram/felix,TrimBiggs/calico,alexhersh/calico,matthewdupre/felix,Metaswitch/calico,ocadotechnology/calico