Should target labels be case insensitive

[bcarter97]

Currently if the target has a matching label to the source with different casing, it will attempt to create the same label from the source resulting in an error:

Creating: [ test ]
Updating: [ help wanted, question, duplicate, documentation, enhancement, wontfix, good first issue, invalid, bug ]
Deleting: [ Test ]

Something went wrong: Failed to create 'test' in '...': Unprocessable Entity

I think this should probably count as an update, and change the casing on the target label.