[Feature Request] Only store commands that return zero

[MahdiNazemi]

Is there an option to only store commands that have not returned an error?

If not, is adding something like if [[ ${exit_code} == 0]] before this line in mcfly.zsh enough?

[cantino]

mcfly logs the exit code and uses it in the sort weighting, but it still records the command. If you didn't want it to record at all, you'd add it your conditional before this line https://github.com/cantino/mcfly/blob/8633cf2e9daf6bd40bfe50eee4c146c1a4725e4b/mcfly.zsh#L55