fix: validation errors to throw 400

[kepelrs]

Addresses #2

[codecov-commenter]

Codecov Report

Merging #3 (a4b95d8) into master (f29f73a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master       #3   +/-   ##
=======================================
  Coverage   99.31%   99.31%           
=======================================
  Files          17       17           
  Lines         436      436           
  Branches       85       85           
=======================================
  Hits          433      433           
  Misses          3        3           

Impacted Files	Coverage Δ
src/crud/helpers.ts	99.18% <100.00%> (ø)
src/crud/validations.ts	100.00% <100.00%> (ø)

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