Release 0.3.1

[ericpre]

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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