v3.0.20

Remove TODO comments and add Ck(err) after commit

Delete TODOs for splitting commit; add Ck(err) after commit

summary of diff --git  a/v3/aidda/aidda.go b/v3/aidda/aidda.go

- Remove TODO comments suggesting to split the commit function
- Add `Ck(err)` to handle errors after performing commit