Lazy-format all logging calls (fix #219)

[devdanzin]

This PR converts wily's logging from using f-strings to % style messages.
Fixes #219.

[codecov-commenter]

Codecov Report

Patch coverage: 92.45% and project coverage change: -2.75% ⚠️

Comparison is base (099bc78) 95.84% compared to head (0469442) 93.10%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
- Coverage   95.84%   93.10%   -2.75%     
==========================================
  Files          25       25              
  Lines        1349     1349              
  Branches      289      289              
==========================================
- Hits         1293     1256      -37     
- Misses         32       68      +36     
- Partials       24       25       +1     

Files Changed	Coverage Δ
src/wily/operators/halstead.py	43.33% <0.00%> (-46.67%)	⬇️
src/wily/operators/maintainability.py	72.00% <0.00%> (-28.00%)	⬇️
src/wily/operators/raw.py	63.15% <0.00%> (-36.85%)	⬇️
src/wily/commands/diff.py	89.53% <66.66%> (ø)
src/wily/__main__.py	95.69% <100.00%> (ø)
src/wily/archivers/git.py	87.65% <100.00%> (ø)
src/wily/cache.py	97.32% <100.00%> (ø)
src/wily/commands/build.py	92.78% <100.00%> (ø)
src/wily/commands/index.py	100.00% <100.00%> (ø)
src/wily/commands/rank.py	96.61% <100.00%> (ø)
... and 6 more

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[tonybaloney]

thanks for doing this