Correct implementation of pkgutil style namespace (#215)
Correct implementation of pkgutil style namespace (#215)

* Correct implementation of pkgutil style namespace

See corresponding PR to luma.core - https://github.com/rm-hull/luma.core/pull/145
Original issue and explanation - https://github.com/rm-hull/luma.core/issues/144

* Update CONTRIBUTING.rst

* Update setup.py

rm-hull/ssd1306