Fix DummyProcess signature

Author: moi90

Lib/multiprocessing/dummy/__init__.py

@@ -34,7 +34,8 @@
 
 class DummyProcess(threading.Thread):
 
-    def __init__(self, group=None, target=None, name=None, args=(), kwargs=None, daemon=None):
+    def __init__(self, group=None, target=None, name=None, args=(), kwargs=None,
+                 *, daemon=None):
         threading.Thread.__init__(self, group, target, name, args, kwargs, daemon=daemon)
         self._pid = None
         self._children = weakref.WeakKeyDictionary()