Fallback to repository if homepage is absent

[Yamakaky]

Choose one: is this a 🙋 feature request

Expected Behavior

When the Cargo.toml parameter repository is present and homepage is absent, no URL is included in the message. If one wants to add the github URL, they need to set it in homepage. It's a bad practice since homepage is for a real home page, not a repository.

Current Behavior

repository is ignored.

Possible Solution

It would be nice to have a fallback to repository if homepage is absent. Or better, print both since they add different useful information.

Context

Code Sample

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