Fix/p2pkhbytelen

[theflyingcodr]

We were missing the varint byte when calculating change length, this adds that in.

[codecov-commenter]

Codecov Report

Merging #31 (aba1414) into master (4445010) will increase coverage by 2.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   76.83%   79.30%   +2.46%     
==========================================
  Files          16       16              
  Lines         885     1029     +144     
==========================================
+ Hits          680      816     +136     
- Misses        139      147       +8     
  Partials       66       66              

Impacted Files	Coverage Δ
tx.go	81.34% <100.00%> (+3.16%)	⬆️
fees.go	100.00% <0.00%> (ø)
varint.go	100.00% <0.00%> (ø)
crypto/hash.go	100.00% <0.00%> (ø)
bytemanipulation.go	100.00% <0.00%> (ø)
input.go	83.33% <0.00%> (+1.07%)	⬆️
output.go	84.15% <0.00%> (+1.20%)	⬆️
crypto/encryption.go	88.23% <0.00%> (+1.56%)	⬆️
bscript/address.go	85.96% <0.00%> (+1.96%)	⬆️
bscript/oppushdata.go	72.83% <0.00%> (+2.17%)	⬆️
... and 6 more

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