Add --alias flag to lambroll rollback

[MasatoshiTada8888]

We can specify an arbitrary alias name with --alias flag for lambroll deploy command.
However, we cannot specify an alias name for lambroll rollback command.
I think lambroll rollback command should have --alias flag.

[fujiwara]

@MasatoshiTada8888 Thank you!
v1.0.2 released! https://github.com/fujiwara/lambroll/releases/tag/v1.0.2