fail warnings

[codingjoe]

• Add argument to fail for warnings
• Fail for warnings in pre-commit to promote incremental changes

[codingjoe]

cc @amureki

[codecov]

Codecov Report

Merging #19 (7282dda) into master (bbcf172) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   93.57%   93.81%   +0.23%     
==========================================
  Files           1        3       +2     
  Lines         109      194      +85     
==========================================
+ Hits          102      182      +80     
- Misses          7       12       +5     

Impacted Files	Coverage Δ
relint.py	93.63% <100.00%> (+0.05%)	⬆️
test_relint.py	96.34% <100.00%> (ø)
setup.py	0.00% <0.00%> (ø)

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