v0.4.0

Changelog

• f2dfad0 Add kuiniu: GPU network probing tool for RoCEv2 clusters
• 33ad56b Extract rotate log writer into util.RotateWriter (#32) (#33)
• ffbf288 Fix kuiniu: client and server now run concurrently with role=both
• 1e2cc90 Fix kuiniu: client peer matching used wrong IP field
• 3b60cd7 Fix kuiniu: don't exit when client/server Run() fails
• a9b4312 Fix kuiniu: echo via GPU network and skip self-echo loops (#31)
• fd2dec4 Fix kuiniu: log to both terminal and file, add key milestone logs
• e33f823 Support both CLI flags and config file in kuiniu
• e0c901f Support role=both for simultaneous client+server in kuiniu