Remove incorrect use of __all__

From the docs:

> If a package’s `__init__.py` code defines a list named `__all__`, it is taken to be **the list of module names** that should be imported when `from package import *` is encountered. It is up to the package author to keep this list up-to-date when a new version of the package is released. Package authors may also decide not to support it, if they don’t see a use for importing * from their package. For example[...]:

>     __all__ = ["echo", "surround", "reverse"]

As is currently in the code, this serves no purpose