Drop click dependency

[jwodder]

Closes #28.

[codecov]

Codecov Report

❌ Patch coverage is 97.24138% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.85%. Comparing base (f2370bc) to head (36eb8ff).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/pyversion_info/__main__.py	97.24%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   96.43%   96.85%   +0.41%     
==========================================
  Files           3        3              
  Lines         365      413      +48     
  Branches       49       52       +3     
==========================================
+ Hits          352      400      +48     
  Misses         10       10              
  Partials        3        3              

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