adding changeToAddress

[theflyingcodr]

Porting ChangeToAddress from master to V2.

[codecov-commenter]

Codecov Report

Merging #24 (cb887e0) into v2 (c3986f1) will increase coverage by 0.07%.
The diff coverage is 74.07%.

@@            Coverage Diff             @@
##               v2      #24      +/-   ##
==========================================
+ Coverage   75.89%   75.96%   +0.07%     
==========================================
  Files          20       20              
  Lines         809      828      +19     
==========================================
+ Hits          614      629      +15     
- Misses        132      134       +2     
- Partials       63       65       +2     

Impacted Files	Coverage Δ
bscript/address.go	84.00% <ø> (ø)
txchange.go	72.22% <74.07%> (+2.41%)	⬆️

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