Edit README.md to indicate version bump MR needed for gem publish
What does this MR do and why?
Adds a small disclaimer that a version bump merge request is required to publish the gem when releasing. It's a bit confusing currently that the release process only needs a tag (and associated release) made like in the pipeline-common project before reading Steps to Release and seeing there are more steps.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.