Feat: NewP2PKHFromBip32ExtKey

[tigh-latte]

Utility func for creating a randomly derived output script from a *bip32.ExtendedKey.

[codecov-commenter]

Codecov Report

Merging #57 (a2aae74) into master (7440322) will decrease coverage by 0.02%.
The diff coverage is 80.95%.

❗ Current head a2aae74 differs from pull request most recent head 5d47176. Consider uploading reports for the commit 5d47176 to get more accurate results

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   84.76%   84.73%   -0.03%     
==========================================
  Files          28       28              
  Lines        3012     3033      +21     
==========================================
+ Hits         2553     2570      +17     
- Misses        325      327       +2     
- Partials      134      136       +2     

Impacted Files	Coverage Δ
bscript/script.go	59.79% <66.66%> (+0.45%)	⬆️
txoutput.go	82.50% <100.00%> (+1.41%)	⬆️

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[theflyingcodr]

Small grammar thing in a comment, apart from that looks good

[theflyingcodr]

LGTM