Add python 3.10

[jlaehne]

Added support for python 3.10 in analogy to https://github.com/hyperspy/hyperspy/pull/2914 Drop 3.6

Progress of the PR

• [x] Change implemented (can be split into several points),
• [x] added line to CHANGELOG.md,
• [x] ready for review.

[codecov-commenter]

Codecov Report

Merging #117 (4fda669) into main (2258151) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #117   +/-   ##
=======================================
  Coverage   95.76%   95.76%           
=======================================
  Files          11       11           
  Lines         591      591           
=======================================
  Hits          566      566           
  Misses         25       25           

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[jlaehne]

Thanks!