attempt to create appveyor matrix supporting both GHC 8.2 + GHC 8.4 with stack
attempt to create appveyor matrix supporting both GHC 8.2 + GHC 8.4 with stack

agentm/project-m36,agentm/project-m36,agentm/project-m36,agentm/project-m36,agentm/project-m36