Merge pull request emqx#3322 from emqx/master Auto-pull-request-by-2020-03-17
Merge pull request emqx#3319 from emqx/master Change global_gc to major mode (emqx#3317)
Merge pull request emqx#3261 from emqx/master
Merge pull request emqx#3240 from emqx/master Receive for the EXIT message on test cases
Merge pull request emqx#3202 from emqx/master Auto-pull-request-by-2020-01-17