Fix/v2 p2pkhbytelen

[theflyingcodr]

Adds the missing varint

[codecov-commenter]

Codecov Report

Merging #32 (bad55a6) into v2 (b2889d5) will increase coverage by 2.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##               v2      #32      +/-   ##
==========================================
+ Coverage   75.45%   77.81%   +2.35%     
==========================================
  Files          18       18              
  Lines         925     1073     +148     
==========================================
+ Hits          698      835     +137     
- Misses        149      160      +11     
  Partials       78       78              

Impacted Files	Coverage Δ
txchange.go	75.90% <100.00%> (+3.68%)	⬆️
fees.go	100.00% <0.00%> (ø)
varint.go	100.00% <0.00%> (ø)
bytemanipulation.go	100.00% <0.00%> (ø)
input.go	79.36% <0.00%> (+0.05%)	⬆️
output.go	87.30% <0.00%> (+1.33%)	⬆️
tx.go	82.05% <0.00%> (+1.63%)	⬆️
signaturehash.go	84.00% <0.00%> (+1.91%)	⬆️
bscript/address.go	85.96% <0.00%> (+1.96%)	⬆️
bscript/oppushdata.go	72.83% <0.00%> (+2.17%)	⬆️
... and 8 more

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