*: update contributing guide (#4325)
*: update contributing guide (#4325)

* Update CONTRIBUTING.md

Co-Authored-By: disksing <042dc4512fa3d391c5170cf3aa61e6a638f84342@disksing.com>
Signed-off-by: Ana Hobden <fe96dd39756ac41b74283a9292652d366d73931f@hoverbear.org>

BusyJay/tikv,BusyJay/tikv,pingcap/tikv,c4pt0r/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv