#4 Duplicate short name should throw an exception

[Albert Strasheim]

Hello,

I recently had the situation where I accidentally annotated two options with the same short name.

I think this should cause JewelCli to throw some kind of RuntimeException as soon as the program starts up as it can cause problems.

Cheers,

Albert

[Tim Wood]

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Thanks for the suggestion. I will try to put that in the next version.