Updated Readme for websocket pubsub #895

Job	Run time
windows	2m 11s
check-lockfile-version	4s
linux-smoke-tests	5m 13s
v2-service-client-tests (macos-latest)	2m 38s
v2-service-client-tests (ubuntu-22.04)	2m 9s
linux	2m 0s
v2-service-client-tests-win (windows-2022)	3m 27s
check-docs	3m 11s
osx (macos-latest)	1m 30s
check-codegen-edits	7s
	22m 30s

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