read change log and readme.md

wu_xinjun

2022-03-07 e1f883778b1a51241a018a7f0c5918f91026aae7

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HAND_SHAKE_MAGIC = b"\x01\x09\x08\x09\x01\x00\x02\x02" 
HEADER_MAGIC = b"\x02\x01\x04\x03\x06\x05\x08\x07"