Retry only for error codes 429 and 529, updated unit tests to support SSL Labs API v3

[kyhau]

Improved (breaking changes)

• Retry only for error codes 429 and 529 (Retry only for error codes 429 and 529 #108).
  Existing approach retries calling the SSL Labs API for a given host when the returned status_code is not 200. In this release, the retry will only apply for the following error codes:
  • 429 - client request rate too high or too many new assessments too fast
  • 529 - the service is overloaded

Improved

• Updated unit tests to support SSL Labs API v3 (Update unit tests to support SSL Labs API v3 #109)
• Updated to build and test also with Python 3.10, drop Python 3.6 (Update to build and test with Python 3.10 and drop Python 3.6 #110).
• Renamed ReleaseNotes.md to CHANGELOG.md.
• Updated README.md with sample console output.
• Fixed badge link to codecov (default branch changed from master to main previously) in README

Added

• Added a standalone script ssllabsscan/export_response.py to export the response payload of a single request to request to https://api.ssllabs.com/api/v3/analyze for a host, in json format.
• Added pull request template .github/pull_request_template.md.
• Added badge link to CodeQL in README

See also CHANGELOG for details.

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