selfishly switching the tests to be netcoreapp2.1 temporarily
selfishly switching the tests to be netcoreapp2.1 temporarily

ericgreenmix/marten,mysticmind/marten,JasperFx/Marten,JasperFx/Marten,ericgreenmix/marten,mysticmind/marten,ericgreenmix/marten,mysticmind/marten,mdissel/Marten,JasperFx/Marten,ericgreenmix/marten,mdissel/Marten,mysticmind/marten