100% test coverage

[jhamman]

This PR adds a few tests that get xbatcher to 100% test coverage.

I've also removed the lint check and will active pre-commit.ci in its place.

[codecov]

Codecov Report

Merging #45 (828318d) into main (95d9fe6) will increase coverage by 5.06%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main       #45      +/-   ##
===========================================
+ Coverage   94.93%   100.00%   +5.06%     
===========================================
  Files           3         2       -1     
  Lines          79        77       -2     
  Branches       16        17       +1     
===========================================
+ Hits           75        77       +2     
+ Misses          3         0       -3     
+ Partials        1         0       -1     

Impacted Files	Coverage Δ
xbatcher/accessors.py	100.00% <100.00%> (ø)
xbatcher/generators.py	100.00% <100.00%> (+1.47%)	⬆️

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