Merge pull request #413 from qimiaoguo/patch-1

wallet: fix change lookahed address

lib/wallet/account.js

@@ -344,7 +344,7 @@ class Account extends bio.Struct {
         break;
       case 1:
         key = this.deriveChange(this.changeDepth);
-        lookahead = this.deriveReceive(this.changeDepth + this.lookahead);
+        lookahead = this.deriveChange(this.changeDepth + this.lookahead);
         await this.saveKey(b, lookahead);
         this.changeDepth += 1;
         this.change = key;