Format code with yapf

This commit fixes the style issues introduced in 2790f48 according to the output
from yapf.

Details: https://deepsource.io/gh/kokarare1212/librespot-python/transform/04a80a03-ea85-44b3-9159-2580bda68c1c/

librespot/audio/decoders.py

@@ -27,9 +27,11 @@ class AudioQuality(enum.Enum):
             return AudioQuality.VERY_HIGH
         raise RuntimeError("Unknown format: {}".format(format))
 
-    def get_matches(self, files: typing.List[AudioFile]) -> typing.List[AudioFile]:
+    def get_matches(self,
+                    files: typing.List[AudioFile]) -> typing.List[AudioFile]:
         file_list = []
         for file in files:
-            if hasattr(file, "format") and AudioQuality.get_quality(file.format) == self:
+            if hasattr(file, "format") and AudioQuality.get_quality(
+                    file.format) == self:
                 file_list.append(file)
         return file_list