Release 0.3.1

[ericpre]

https://github.com/hyperspy/exspy/blob/main/releasing_guide.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.83%. Comparing base (1dffbe2) to head (48f34fb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #92   +/-   ##
=======================================
  Coverage   88.83%   88.83%           
=======================================
  Files          77       77           
  Lines        7476     7476           
  Branches     1023     1023           
=======================================
  Hits         6641     6641           
  Misses        568      568           
  Partials      267      267           

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