update the protoc version to 3.12.3 in readme.md (#7931)

Signed-off-by: Luke Chen <showuon@gmail.com>
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Luke Chen 2020-09-14 16:08:27 +08:00 committed by GitHub
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@ -4,6 +4,6 @@ re-compile them when building Prometheus.
If however you have modified the defs and do need to re-compile, run
`make proto` from the parent dir.
In order for the script to run, you'll need `protoc` (version 3.5.1) in your
In order for the script to run, you'll need `protoc` (version 3.12.3) in your
PATH.