Update contribute.rst
Update contribute.rst

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