2.0.0 release

[nkoenig]

Signed-off-by: Nate Koenig nate@openrobotics.org

🎈 Release

Preparation for 2.0.0 release.

Change log was updated in #79.

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed):

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (gz-utils2@0f16906). Click here to learn what that means.
The diff coverage is n/a.

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