wallet: fix change lookahed address

[qimiaoguo]

change address will not be saved if call hsw-cli change

[codecov-io]

Codecov Report

Merging #413 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #413      +/-   ##
==========================================
- Coverage   61.69%   61.68%   -0.01%     
==========================================
  Files         129      129              
  Lines       34824    34824              
  Branches     5916     5916              
==========================================
- Hits        21484    21482       -2     
- Misses      13340    13342       +2     

Impacted Files	Coverage Δ
lib/wallet/account.js	76.09% <100.00%> (ø)
lib/covenants/rules.js	73.04% <0.00%> (-0.15%)	⬇️
lib/script/script.js	59.32% <0.00%> (-0.09%)	⬇️

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[qimiaoguo]

bcoin-org/bcoin#503
bcoin-org/bcoin#498

[pinheadmz]

Thank you. Can you please just include the module name with your commit message:

wallet: fix change lookahead address

[chjj]

@qimiaoguo, thank you for finding this. A patch update was just published.

I think we should consider a migration path for affected wallets. I think a simple migration would be to regenerate and save all change addresses in the lookahead. The user will most likely have to rescan after that (whether to do this automatically or require user intervention is something I'm unsure of).