Fix code style issues with Black

discord/mixins.py

@@ -23,10 +23,11 @@ DEALINGS IN THE SOFTWARE.
 """
 
 __all__ = (
-    'EqualityComparable',
-    'Hashable',
+    "EqualityComparable",
+    "Hashable",
 )
 
+
 class EqualityComparable:
     __slots__ = ()
 
@@ -40,6 +41,7 @@ class EqualityComparable:
             return other.id != self.id
         return True
 
+
 class Hashable(EqualityComparable):
     __slots__ = ()