avoid swallowing errors in the master
more info for multi-mode
v0.2.6
avoid waitpid when no children exist
v0.2.7
show remote hostnames
prepare before connecting to relay master
v0.2.8
start master server listener early
v0.2.9
Support minitest >= 4.7

resolve #7
Support minitest5's verbose output
Reject minitest5's empty test methods
Fix incorrectly triggered minitest5's TestQueue::Iterator#each