Prepare for v3.1.2

[bhazelton]

Description

Update the changelog for v3.1.2.

Also includes a small improvement to the MWA beam docstring.

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation change (documentation changes only)
• Version change
• Build or continuous integration change

Checklist:

• I have read the contribution guide.
• My code follows the code style of this project.

Version change checklist:

• I have updated the CHANGELOG to put all the unreleased changes under the new version (leaving the unreleased section empty).
• I have noted any dependency changes since the last version and will update the conda package build accordingly.

No dependency changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.93%. Comparing base (2b3eaf3) to head (686af99).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1501   +/-   ##
=======================================
  Coverage   99.93%   99.93%           
=======================================
  Files          63       63           
  Lines       21834    21834           
=======================================
  Hits        21819    21819           
  Misses         15       15           

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[steven-murray]

LGTM!

[mkolopanis]

also good with tihs but the warning tests really don't like us right now do they?

[bhazelton]

IERS seems to be having issues again. Fortunately it only breaks the warning tests, not the regular tests.

[mkolopanis]

Hm I, for one, would be willing to accept the warning test IERS failures and merge if others are okay with it. I know HERA related repos are waiting on a version bump