Fix lint errors

[janosh]

57f5ca9 bump pre-commit black version
face368 fix PT027: use pytest.raises instead of unittest-style assertRaises

[codecov-commenter]

Codecov Report

Patch coverage: 34.32% and project coverage change: -0.10% ⚠️

Comparison is base (e133fe0) 66.20% compared to head (9ade654) 66.11%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
- Coverage   66.20%   66.11%   -0.10%     
==========================================
  Files          51       51              
  Lines        5590     5610      +20     
==========================================
+ Hits         3701     3709       +8     
- Misses       1889     1901      +12     

Files Changed	Coverage Δ
custodian/cli/run_vasp.py	0.00% <0.00%> (ø)
...todian/qchem/tests/test_job_handler_interaction.py	37.87% <0.00%> (ø)
custodian/vasp/jobs.py	49.72% <0.00%> (ø)
custodian/qchem/tests/test_jobs.py	23.91% <6.81%> (-0.54%)	⬇️
custodian/ansible/tests/test_interpreter.py	100.00% <100.00%> (ø)
custodian/tests/test_custodian.py	98.90% <100.00%> (+0.04%)	⬆️
custodian/vasp/tests/test_handlers.py	99.78% <100.00%> (ø)
custodian/vasp/tests/test_jobs.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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