Removed FluentAssertions in favour of Shouldly

[MooVC]

Pull Request

Description

Please provide a brief description of the changes you have made, including the problem this PR solves, or the feature it implements.

• Type of change: Refactoring
• Related issues: Update ownership and license fluentassertions/fluentassertions#2943

Migration from FluentAssertions to Shouldly. There is no functional change to Valuify in this push.

Checklist

Please ensure the following are true for your PR:

• I have followed the project's coding style guidelines.
• I have added tests that prove my fix is effective or that my feature works.
• I have verified that new and existing unit tests pass locally with my changes.
• I have updated the documentation (if applicable).
• I have confirmed that my code is free from warnings and errors.
• I have reviewed suggestions and determined no actions is required.
• I have updated the CHANGELOG.md
• I have performed a self-review of my code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.95%. Comparing base (987de3c) to head (96baaaf).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   92.95%   92.95%           
=======================================
  Files          37       37           
  Lines         696      696           
  Branches       69       69           
=======================================
  Hits          647      647           
  Misses         22       22           
  Partials       27       27           

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[jcfnomada]

Please the possibility to use https://github.com/AwesomeAssertions/AwesomeAssertions. There are a lot of old a recent contributers already in the project, so it is expected to continue it's work with bug fixes and new features.