Fixed

• Fixed Http2 ping frame bug (0f074a6) (371d0b8) (e28ed13) (@twose) (@shiguangqi)
• Fixed OSX signal bug (6d06a2c) (6b66f56) (@twose)
• Fixed Coroutine\Http\Client->setData (53d9d1a) (@twose)
• Remove HAVE_IPV6 (3effad3) (@matyhtf)
• PHP7.4 compatibility (#2506) (@twose)