Master branch updates

[chapulina]

Part of gazebo-tooling/release-tools#416

Summary

Update all usage of master.

Also added some tables to the README to match other libraries.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #141 (cbd01dc) into ign-msgs5 (3baee04) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-msgs5     #141   +/-   ##
==========================================
  Coverage      84.38%   84.38%           
==========================================
  Files              7        7           
  Lines            807      807           
==========================================
  Hits             681      681           
  Misses           126      126           

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