Add missing files to MANIFEST.in

[mikemhenry]

Since we build on conda-forge with a tarball and not in a git repo, setuptools_scm doesn't know what files to include via tracking, and then falls back to default behavior, so we need to include these files in the MANIFEST.in. We should investigate if there are other ways to do this.

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• Added a news entry

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.87%. Comparing base (5adabac) to head (f0acf5c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #761   +/-   ##
=======================================
  Coverage   98.87%   98.87%           
=======================================
  Files          42       42           
  Lines        2669     2669           
=======================================
  Hits         2639     2639           
  Misses         30       30           

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[github-actions]

No API break detected ✅

[atravitz]

lgty!