killercup / cargo-edit

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Auto merge of #89 - waynenilsen:feat-upgrade-flag, r=killercup

Upgrade flag another try at #61

I am working on a second try at #61 and wanted to submit a work in progress checkpoint to see if you're on board with the method for implementing the feature. I initially wanted to have docopt parse to a rust enum but couldn't quite figure that out so I figured that we could just handle invalid parameters sent to this flag with a panic.

The code is different enough that I figured I would just start over from latest master. What do you think so far?

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