README.md: add link to atomic-devel list
README.md: add link to atomic-devel list

maxamillion/atomic-reactor,jarodwilson/atomic-reactor,maxamillion/atomic-reactor,david-martin/atomic-reactor,jpopelka/atomic-reactor,vrutkovs/atomic-reactor,fr34k8/atomic-reactor,projectatomic/atomic-reactor,DBuildService/atomic-reactor,fr34k8/atomic-reactor,projectatomic/atomic-reactor,DBuildService/atomic-reactor,jpopelka/atomic-reactor,jarodwilson/atomic-reactor,vrutkovs/atomic-reactor,david-martin/atomic-reactor