Fallback/Suggestions for hypen/underscore mismatch.

[melMass]

Follow up on #53

AFAIK there is no real standard around that but a lot of packages are using hyphens in their names (while not allowed in imports) yet some still use underscore to match the import name!

Cargo-download for instance does fallback automatically. While this is not wanted for clone, there could at least be a fallback search of alternative punctuation if the package is not found and report the typo to the end user