readme: bump -bad requirement for shm plugin
readme: bump -bad requirement for shm plugin

ahmedammar/skype_farsight2,tieto/farstream,pexip/farstream,tieto/farstream,pexip/farstream,shadeslayer/farstream,ahmedammar/skype_farsight2,ahmedammar/skype_farsight2,shadeslayer/farstream,kakaroto/farstream,shadeslayer/farstream,kakaroto/farstream,tieto/farstream,tieto/farstream,shadeslayer/farstream,ahmedammar/skype_farsight2,kakaroto/farstream,pexip/farstream,kakaroto/farstream,pexip/farstream,tieto/farstream