Adding support for querying the AWS Config resource for S3.

- Need to add support still for batch requests and batch aggregation requests in a future PR

moto/config/responses.py

@@ -102,6 +102,12 @@ class ConfigResponse(BaseResponse):
                                                                          self._get_param('NextToken'))
         return json.dumps(schema)
 
+    def get_resource_config_history(self):
+        schema = self.config_backend.get_resource_config_history(self._get_param('resourceType'),
+                                                                 self._get_param('resourceId'),
+                                                                 self.region)
+        return json.dumps(schema)
+
     """
     def batch_get_resource_config(self):
         # TODO implement me!
@@ -110,8 +116,4 @@ class ConfigResponse(BaseResponse):
     def batch_get_aggregate_resource_config(self):
         # TODO implement me!
         return ""
-
-    def get_resource_config_history(self):
-        # TODO implement me!
-        return ""
     """