Allow passing array to `env-file` parameter about crane HOT 4 CLOSED

Thanks, glad you enjoy Crane.
--env-file might have changed, I think it was just a string when I implemented it.

Now, even if your Golang knowledge is quite basic, it's really easy to get into and a pull request would be highly welcome! Should be similar to https://github.com/michaelsauter/crane/blob/c13cb961be4aeeca74c0b182481370af723093bb/crane/container.go#L137-143.

Want to give it a shot?

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To be backward-compatible, and for sanity, I am wondering if it should also be possible to provide a string-value env-file as the syntax allows it today (and not be forced to use a single-element array) a la https://github.com/michaelsauter/crane/blob/c13cb96/crane/container.go#L232-L243. That would need to be done consistently for all flags that can be repeated though, so I guess it could be done in a separate PR.

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Crane is still not past 1.0, so I'm OK with breaking behaviour. I always wanted to be as close to raw Docker commands/flags as possible, so I think this is best implemented as array-only as that is what the official docs suggest.

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Closed via #98.

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