Case-insensitive license name matching

[khatkar]

• Matching license names with allow-only and fail-on options is no longer case-sensitive #145
• Updated Readme and tests

[codecov[bot]]

Codecov Report

Merging #146 (4864621) into master (5ead5c1) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #146   +/-   ##
=======================================
  Coverage   99.73%   99.74%           
=======================================
  Files           1        1           
  Lines         378      392   +14     
=======================================
+ Hits          377      391   +14     
  Misses          1        1           

Impacted Files	Coverage Δ
piplicenses.py	99.74% <100.00%> (+<0.01%)	:arrow_up:

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