Whatsonpypi

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* add --comment to allow mentioning comments with --add

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* add --req-pattern to allow specifying search pattern for requirements files
* raise Error when no requirements files are found

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* Fix empty dependencies display

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* Small fixes

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* Add -a/--add to enable adding packages to requirement files.
* Added -d/--docs to launch docs URL in browser
* Allow version specific querying

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* Display more package info
* added --more/-m for even more info