fix: maxlength of vendorfield

[kalgoop]

Proposed Change

take substring of value in vendorfield, if larger than 64 characters

if value is already less than 64 characters, substring function returns the same string

[alexbarnsley]

It would be better to throw an error I think. taking a substring could result in undesired effects for the person doing it

[faustbrian]

As @alexbarnsley said an error is the way to do it as this could result in an order not being able to be paid.

[codecov-io]

Codecov Report

Merging #1 into master will increase coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #1      +/-   ##
==========================================
+ Coverage   85.82%   85.93%   +0.11%     
==========================================
  Files           1        1              
  Lines         127      128       +1     
  Branches       20       21       +1     
==========================================
+ Hits          109      110       +1     
  Misses         16       16              
  Partials        2        2

Impacted Files	Coverage Δ
lib/index.js	85.93% <100%> (+0.11%)	⬆️

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