Mock libnacl.sign

docs/conf.py

@@ -31,7 +31,7 @@ class Mock(MagicMock):
     def __getattr__(cls, name):
             return Mock()
 
-MOCK_MODULES = ['libnacl']
+MOCK_MODULES = ['libnacl.sign']
 sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
 
 # If your documentation needs a minimal Sphinx version, state it here.