Use Otter Grade CLI to override otter_config.json values

[chrispyles]

Closes #395

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (6d7d48b) 80.09% compared to head (dc1ba79) 80.14%.

Additional details and impacted files

@@            Coverage Diff             @@
##             beta     #661      +/-   ##
==========================================
+ Coverage   80.09%   80.14%   +0.04%     
==========================================
  Files          62       62              
  Lines        3999     4009      +10     
==========================================
+ Hits         3203     3213      +10     
  Misses        796      796              

Impacted Files	Coverage Δ
otter/cli.py	100.00% <100.00%> (ø)
otter/grade/__init__.py	83.33% <100.00%> (+0.40%)	⬆️
otter/grade/containers.py	100.00% <100.00%> (ø)

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