Update sbt-protoc in README.md #445

Job	Run time
build (ubuntu-latest)	3m 27s
scripted (ubuntu-latest, 1.2.8)	7m 47s
build (macos-latest)	8m 47s
scripted (ubuntu-latest, 1.3.13)	5m 50s
build (windows-latest)	4m 31s
scripted (ubuntu-latest, project)	6m 0s
scripted (macos-latest, 1.2.8)	15m 35s
scripted (macos-latest, 1.3.13)	14m 23s
scripted (macos-latest, project)	11m 39s
scripted (windows-latest, 1.2.8)	9m 36s
scripted (windows-latest, 1.3.13)	8m 9s
scripted (windows-latest, project)	8m 4s
ci-passed	1s
	1h 43m 49s

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