update appveyor.yml. remove draft/prerelease
update appveyor.yml. remove draft/prerelease

kamatama41/mackerel-agent,stanaka/mackerel-agent,stanaka/mackerel-agent,kamatama41/mackerel-agent,kamatama41/mackerel-agent,mackerelio/mackerel-agent,mackerelio/mackerel-agent,yyljlyy/mackerel-agent,yyljlyy/mackerel-agent,mackerelio/mackerel-agent,yyljlyy/mackerel-agent,kamatama41/mackerel-agent,stanaka/mackerel-agent,yyljlyy/mackerel-agent,stanaka/mackerel-agent