Remove redundant README generation

[zakame]

We already have a README.md so this is unnecessary, and the test for
this breaks the ability to install this dist directly from git.

[codecov-io]

Codecov Report

Merging #8 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   98.31%   98.26%   -0.06%     
==========================================
  Files           2        2              
  Lines         119      115       -4     
  Branches       26       22       -4     
==========================================
- Hits          117      113       -4     
  Misses          1        1              
  Partials        1        1

Impacted Files	Coverage Δ
lib/Math/Util/CalculatedValue.pm	99.03% <0%> (-0.04%)	⬇️

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