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Feature Request

Thanks for making an awesome product.

In my project, I split my code to several packages, which are published to pypi. The problem is after I upload a new version of a package on pypi, poetry doesn't know that the package has been updated and throw SolverProblemError (depends on package X which doesn't match any versions) if I use the updated package somewhere else.

I think this may be due caching. Clearing poetry cache: poetry cache clear pypi --all does help me solve the problem. However, it's so slow as poetry has to repopulate the cache for all other packages.

I think it would be great to have:

• the ability to invalidate/clear cache of specific packages, or
• automatically fetch new version of a package if the requested version is newer than the current one in the cache or when it fails to resolve dependencies.

Thanks!