disable MiMa for now for 2.13
disable MiMa for now for 2.13

to be brought back sometime around or before 2.13.0-RC1

lrytz/scala,scala/scala,scala/scala,scala/scala,lrytz/scala,scala/scala,scala/scala,lrytz/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,martijnhoekstra/scala