Explicit schema_id in gio.Settings init
Created by: ederag
Fixed
> python3 tests/stuff_test.py
/home/ederag/share/prog/python/hamster/src/hamster/lib/configuration.py:203:
PyGIDeprecationWarning:
Using positional arguments with the GObject constructor has been deprecated.
Please specify keyword(s) for "schema" or use a class specific constructor.
See: https://wiki.gnome.org/PyGObject/InitializerDeprecations
self._settings = gio.Settings('org.gnome.Hamster')