Fix PackageReadmeFile and apply analyzers

[sungam3r]

fixes #268

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.77%. Comparing base (c3852ad) to head (51e3cec).
⚠️ Report is 75 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          85       85           
  Lines        4467     4471    +4     
  Branches      448      448           
=======================================
+ Hits         4457     4461    +4     
  Misses          8        8           
  Partials        2        2           

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