Singular location for version information

[elbeejay]

In #50 we end up with 2 places where package version information exists:

1. __init__.py
2. pyproject.toml

Ideally it only exists in one place, and maintains the expected behavior of allowing a user to do the following in Python:

import dorado

print(dorado.__version__)

and have their dorado version number print out to the console. There is surely a way to accomplish this, just didn't come to be instantly when working on #47