Return exit code 1 when undo migration failed

[nehaabrol87]

I see that exit code 1 is returned when a migration fails but same is not handled/returned when last migration is undone (undo).
I am using sequelize 1.9.2
Is there a reason why this is as is.

I see this was fixed #110 but the corresponding PR only catches errors for ups and not downs.

#161

[nehaabrol87]

Oops I just noticed it exists in master.
Can you tell me which is the version where this first became available.I guess it is 2.3.0 but just wanted to confirm.
I guess this is not an issue then.

[AFBarstow]

I would like to +1/upvote getting cba03c8f pushed to a new release since not having this is quite painful for our application. Is there a rough-ish ETA when we can expect this commit in a release?

[gotrevor]

This has also been requested over here: #374

[sushantdhiman]

480f3fc