Make sure tuple behaves similar to Tuple, fixes #2040

jedi/inference/__init__.py

@@ -145,6 +145,10 @@ class InferenceState:
         typing_module, = self.import_module(('types',))
         return typing_module
 
+    @inference_state_function_cache()
+    def typing_tuple(self):
+        return self.typing_module.py__getattribute__("Tuple")
+
     def reset_recursion_limitations(self):
         self.recursion_detector = recursion.RecursionDetector()
         self.execution_recursion_detector = recursion.ExecutionRecursionDetector(self)