REL: Update version to 1.2.0

[Gui-FernandesBR]

Pull request type

• Code changes (bugfix, features)

Checklist

• Tests for the changes have been added (if needed)
• Docs have been reviewed and added / updated
• Lint (black rocketpy/ tests/) has passed locally
• All tests (pytest tests -m slow --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

New behavior

Updating to the next version, more than 302 commits are going to be included in this next release.

Breaking change

• No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9da1542) 72.47% compared to head (d4ac946) 72.47%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #555   +/-   ##
=======================================
  Coverage   72.47%   72.47%           
=======================================
  Files          59       59           
  Lines        9567     9567           
=======================================
  Hits         6934     6934           
  Misses       2633     2633           

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[lucasfourier]

Good to go.

[giovaniceotto]

Ready when you are!