don't let a hyphen ruin an ident party

[softprops]

fixes #14

Was motivated to grab this because I'll likely run into this sooner for my particular mashup use case.

[softprops]

ha! actually I ran into this immediately after putting the latest mashup to the test for my use case.

I'm using rust to deploy serverless aws lambda functions. A motivation for seeking out a crate like mashup was the awkwardness of not being able to use concat_idents! ( or strings even if that was stable ) for providing cpython identifiers. This builds off of the crowbar lambda crate which has the same limitation so by default crate lib's for crowbar/lambda must be named lambda out of expectation.

I put mashup to the test and that works as expected... except when crate names have hyphens, just like a my serverless template repo does :)

What are the chances of this getting merged and released within the next few days? That would unblock my confidence and pushing my original usecase forward. Less potential footguns!

[softprops]

thanks again @dtolnay!

[softprops]

following to to confirm, this fixed worked like a charm with my use case.