Add other validators

[Firehed]

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[codecov]

Codecov Report

Merging #20 (c4d9d4a) into v3 (f5625bc) will decrease coverage by 5.39%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                 v3      #20      +/-   ##
============================================
- Coverage     65.02%   59.62%   -5.40%     
- Complexity       88      101      +13     
============================================
  Files            14       17       +3     
  Lines           243      265      +22     
============================================
  Hits            158      158              
- Misses           85      107      +22     

Impacted Files	Coverage Δ
src/Validators/Dictionary.php	0.00% <0.00%> (ø)
src/Validators/ListOf.php	0.00% <0.00%> (ø)
src/Validators/Nullable.php	0.00% <0.00%> (ø)

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