Don't use root logger

[davisdude]

Python documentation recommends against logging to the root logger. This changes logging to slippi.log instead. (You could also change the logger to slippi or something else; __name__ is just the most commonplace).

It is strongly advised that you do not log to the root logger in your library. Instead, use a logger with a unique and easily identifiable name, such as the __name__ for your library’s top-level package or module. Logging to the root logger will make it difficult or impossible for the application developer to configure the logging verbosity or handlers of your library as they wish.