correct URL

prompted by your PR on dimpase/primecount

Author: dimpase

setup.py

@@ -30,7 +30,7 @@ def run(self):
     description='An extension class to allocate memory easily with cython',
     long_description=long_description,
     long_description_content_type='text/markdown',
-    url='https://github.com/kliem/memory_allocator',
+    url='https://github.com/sagemath/memory_allocator',
     author='Jeroen Demeyer, Nathann Cohen, Jonathan Kliem',
     author_email='[email protected]',
     license='GPLv3',