Drop Python 3.7

[jbusecke]

Just noticed these errors in the CI for python 3.7. It seems related to dask, and I noticed that dask does not support 3.7 since over a year. So I am removing 3.7 support here.

[jbusecke]

Also added 3.10 to the CI.

[codecov[bot]]

Codecov Report

Merging #139 (46eb5c3) into master (09b6fcb) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 46eb5c3 differs from pull request most recent head 07170a3. Consider uploading reports for the commit 07170a3 to get more accurate results

@@           Coverage Diff           @@
##           master     #139   +/-   ##
=======================================
  Coverage   77.60%   77.60%           
=======================================
  Files           3        3           
  Lines         326      326           
  Branches       60       61    +1     
=======================================
  Hits          253      253           
+ Misses         49       48    -1     
- Partials       24       25    +1     

Flag	Coverage Δ
unittests	77.30% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
xmovie/core.py	83.58% <0.00%> (ø)

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