Using --test option exits with code 2

[tzeikob]

The client exits with code 2 when using the --test option:

./releaze --bump major --test

[tzeikob]

It seems that jest in using stderr to print output even for passed tests, this means the exec('npm', ['test']) will reject as well giving a false negative thrown error.

According to this #5064 open issue, jest still seems to be buggy.

Solution to this will be either to drop the --test option or to refactor exec to handle stderr as not error and resolve to { stdout, stderr } and leave the caller to decide what to do if stderr is not null.

Note: this is related only to those using jest for testing via npm test.

[tzeikob]

Dropping the --test option seems to be the right choice for the moment.

Perhaps we can revisit this issue in the future.