Add case-insensitive option

[lqez]

No description provided.

[codecov]

Codecov Report

Merging #1 into master will increase coverage by 0.17%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #1      +/-   ##
==========================================
+ Coverage   95.69%   95.87%   +0.17%     
==========================================
  Files           3        3              
  Lines          93       97       +4     
==========================================
+ Hits           89       93       +4     
  Misses          4        4

Impacted Files	Coverage Δ
slmd/slmd.py	100% <100%> (ø)	⬆️
slmd/__init__.py	100% <100%> (ø)	⬆️
slmd/cmd.py	82.6% <100%> (+0.79%)	⬆️

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