setup.py: use SHA256 instead of MD5 to check the integrity of mock.py

setup.py

@@ -16,7 +16,7 @@ Topic :: Software Development :: Libraries :: Python Modules
 
 mock = 'neo/tests/mock.py'
 if not os.path.exists(mock):
-    import cStringIO, hashlib,subprocess,  urllib, zipfile
+    import cStringIO, hashlib, subprocess, urllib, zipfile
     x = 'pythonmock-0.1.0.zip'
     try:
         x = subprocess.check_output(('git', 'cat-file', 'blob', x))
@@ -24,8 +24,9 @@ if not os.path.exists(mock):
         x = urllib.urlopen(
             'http://downloads.sf.net/sourceforge/python-mock/' + x).read()
     mock_py = zipfile.ZipFile(cStringIO.StringIO(x)).read('mock.py')
-    if hashlib.md5(mock_py).hexdigest() != '79f42f390678e5195d9ce4ae43bd18ec':
-        raise EnvironmentError("MD5 checksum mismatch downloading 'mock.py'")
+    if (hashlib.sha256(mock_py).hexdigest() !=
+        'c6ed26e4312ed82160016637a9b6f8baa71cf31a67c555d44045a1ef1d60d1bc'):
+        raise EnvironmentError("SHA checksum mismatch downloading 'mock.py'")
     open(mock, 'w').write(mock_py)
 
 zodb_require = ['ZODB3>=3.10dev']