Fix: Allow rename of addon's folder

[Irmitya]

Fixes #4 and #5

[Irmitya]

The code uses from .. import __package__, which works.
However, I would "prefer" it use from .. import __package__ as __addon__

Python uses __package__ for things, such as the from . thing.
The reason the code works anyway, is because I inadvertently placed the import below the other relative import.