fix: support len validator

[JimmyDaddy]

attr

[codecov-commenter]

Codecov Report

Merging #188 (e18bdfb) into master (5d06e6e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #188   +/-   ##
=======================================
  Coverage   96.79%   96.79%           
=======================================
  Files          39       39           
  Lines        2963     2964    +1     
=======================================
+ Hits         2868     2869    +1     
  Misses         95       95           

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

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