Flask-Collect distribution erroneously contains a `tests` package

[alexdutton]

The current source package and wheel on PyPI (version 1.3.2) contain a top-level "tests" package, which shouldn't be included.

It means that I can't do pkg_resources.resource_stream("tests", "path/to/fixture") in my own tests directory, as it instead picks up the installed package instead of the locally-importable tests package.