Add missing keyword arguments to fake prange() function in Shadow.py.

Cython/Shadow.py

@@ -455,7 +455,7 @@ class CythonDotParallel(object):
     def parallel(self, num_threads=None):
         return nogil
 
-    def prange(self, start=0, stop=None, step=1, schedule=None, nogil=False):
+    def prange(self, start=0, stop=None, step=1, nogil=False, schedule=None, chunksize=None, num_threads=None):
         if stop is None:
             stop = start
             start = 0