Added missing Required method on string type.

[GooRiOn]

Info

This Pull Request is related to issue no. #128

It turned out that we had Required() method for string which was simply put inside Property extensions (since it referce to all reference types) but it didn't support string.Empty. Therefore after adding Required() for string I had to change two unit tests.

Changes

• Added Required() to the string type
• Fixed two unit tests
• Rearranged code in strategies unittests to fir pur template

[codecov[bot]]

Codecov Report

Merging #130 into develop will increase coverage by <.01%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #130      +/-   ##
===========================================
+ Coverage    99.85%   99.85%   +<.01%     
===========================================
  Files           36       36              
  Lines          698      699       +1     
===========================================
+ Hits           697      698       +1     
  Misses           1        1

Impacted Files	Coverage Δ
src/Valit/ValitRuleStringExtensions.cs	100% <100%> (ø)	:arrow_up:

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[GooRiOn]

fixed