update requirements (#3823)

src/flask/blueprints.py

@@ -451,16 +451,14 @@ class Blueprint(Scaffold):
         return decorator
 
     def app_url_value_preprocessor(self, f):
-        """Same as :meth:`url_value_preprocessor` but application wide.
-        """
+        """Same as :meth:`url_value_preprocessor` but application wide."""
         self.record_once(
             lambda s: s.app.url_value_preprocessors.setdefault(None, []).append(f)
         )
         return f
 
     def app_url_defaults(self, f):
-        """Same as :meth:`url_defaults` but application wide.
-        """
+        """Same as :meth:`url_defaults` but application wide."""
         self.record_once(
             lambda s: s.app.url_default_functions.setdefault(None, []).append(f)
         )

src/flask/scaffold.py

@@ -32,8 +32,7 @@ def setupmethod(f):
 
 
 class Scaffold(_PackageBoundObject):
-    """A common base for class Flask and class Blueprint.
-    """
+    """A common base for class Flask and class Blueprint."""
 
     #: Skeleton local JSON decoder class to use.
     #: Set to ``None`` to use the app's :class:`~flask.app.Flask.json_encoder`.