add note about --log-driver being unsupported
add note about --log-driver being unsupported

joyent/sdc-docker,owlin/sdc-docker,misterdjules/sdc-docker,mehulsbhatt/sdc-docker,misterdjules/sdc-docker,richardkiene/sdc-docker,joyent/sdc-docker,owlin/sdc-docker,bixu/sdc-docker,mehulsbhatt/sdc-docker,bixu/sdc-docker,richardkiene/sdc-docker