199 Prepare for `3.0.0-rc2` release

[sgnn7]

What does this PR do?

• Updates the CHANGELOG and metadata for 3.0.0-rc2 pending release.
• Adds a few more tags to metadata to match us with the Ansible module

What ticket does this PR close?

Connected to #199

Checklists

Change log

• [x] The CHANGELOG has been updated, or
• [ ] This PR does not include user-facing changes and doesn't require a CHANGELOG update

Test coverage

• [ ] This PR includes new unit and integration tests to go with the code changes, or
• [x] The changes in this PR do not require tests

Documentation

• [ ] Docs (e.g. READMEs) were updated in this PR, and/or there is a follow-on issue to update docs, or
• [x] This PR does not require updating any documentation

[sgnn7]

~Blocked by https://github.com/cyberark/parse-a-changelog/issues/29~

[izgeri]

just noting that we got the ok to merge this AM.