Show's naenae success when commitizen is canceled

[bitjson]

Commitizen doesn't return an error code, so the "naenae completed" box is shown even when files remain staged and uncommitted.

[bitjson]

Pull request will have to be made to Commitizen.

[bitjson]

Reproduce:

npm install -g wip
wip with cz
mkdir test && cd test
git init
touch test.txt
wip
naenae

When naenae executes git-cz, if the commit is canceled or fails, no error code is returned. This causes naenae to return a success message when it should warn the user that changes are still staged and waiting for commit.