Source meta long description from the README file

[webknjaz]

https://pypi.org/project/distlib/ looks empty with a one-liner. This should improve how it looks and make it a bit more informative.

[codecov]

Codecov Report

Merging #176 (7d15249) into master (91aa92e) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
- Coverage   83.10%   83.05%   -0.05%     
==========================================
  Files          24       24              
  Lines        8876     8876              
  Branches     1829     1829              
==========================================
- Hits         7376     7372       -4     
  Misses       1154     1154              
- Partials      346      350       +4     

Flag	Coverage Δ
unittests	82.18% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
distlib/wheel.py	79.97% <0.00%> (-0.54%)	⬇️

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