fix: update error message for integer

[snitin315]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

update error message for integer

Breaking Changes

None

Additional Info

No

[codecov]

Codecov Report

Merging #136 (80fccfc) into master (7e2d9f5) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #136   +/-   ##
=======================================
  Coverage   97.58%   97.58%           
=======================================
  Files           6        6           
  Lines         705      705           
  Branches      301      301           
=======================================
  Hits          688      688           
  Misses         15       15           
  Partials        2        2           

Impacted Files	Coverage Δ
src/ValidationError.js	96.73% <100.00%> (ø)

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[alexander-akait]

Thanks