Replace comparison with None with equality operator

test/test_evaluate/test_context.py

@@ -4,7 +4,7 @@ from jedi import Script
 def test_module_attributes():
     def_, = Script('__name__').completions()
     assert def_.name == '__name__'
-    assert def_.line == None
+    assert def_.line is None
-    assert def_.column == None
+    assert def_.column is None
     str_, = def_._goto_definitions()
     assert str_.name == 'str'