docs: update README files with latest release and coverage badges #485

Job	Run time
list-packages	4s
tests (ubuntu-latest, 20, redis-smq-rest-api)	2m 24s
tests (ubuntu-latest, 20, redis-smq-common)	2m 38s
tests (ubuntu-latest, 20, redis-smq-tools)	1m 7s
tests (ubuntu-latest, 20, redis-smq)	2m 38s
	8m 51s

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