Use pathlib in Extension

mopidy_raspberry_gpio/__init__.py

@@ -1,5 +1,5 @@
 import logging
-import os
+import pathlib
 
 from mopidy import config, ext
 
@@ -18,8 +18,7 @@ class Extension(ext.Extension):
     version = __version__
 
     def get_default_config(self):
-        conf_file = os.path.join(os.path.dirname(__file__), "ext.conf")
-        return config.read(conf_file)
+        return config.read(pathlib.Path(__file__).parent / "ext.conf")
 
     def get_config_schema(self):
         schema = super().get_config_schema()