Reformat README.md to use markdown style link format so set_dependent_versions.py script can update links automatically
Reformat README.md to use markdown style link format so
set_dependent_versions.py script can update links automatically

BillFlorioSFDC/Cumulus,cdcarter/Cumulus,cyberjus/Cumulus,abeyer/Cumulus,SalesforceFoundation/Cumulus,BillFlorioSFDC/Cumulus,jlantz/Cumulus,jarkos88/Cumulus1,InspectorSpacetime/Cumulus,Zosoled/Cumulus,cdcarter/Cumulus,SalesforceFoundation/Cumulus,abeyer/Cumulus,cdcarter/Cumulus,SalesforceFoundation/Cumulus,cyberjus/Cumulus,jlantz/Cumulus,cdcarter/Cumulus,BillFlorioSFDC/Cumulus,Zosoled/Cumulus,jarkos88/Cumulus1,abeyer/Cumulus,ehrenfoss/Cumulus,ehrenfoss/Cumulus,InspectorSpacetime/Cumulus,InspectorSpacetime/Cumulus,abeyer/Cumulus,jlantz/Cumulus,SalesforceFoundation/Cumulus,BillFlorioSFDC/Cumulus,jarkos88/Cumulus1,ehrenfoss/Cumulus,Zosoled/Cumulus,cyberjus/Cumulus,InspectorSpacetime/Cumulus,jlantz/Cumulus,Zosoled/Cumulus,cyberjus/Cumulus