Update readme_renderer/rst.py

Co-authored-by: Brian Rutledge <brian@bhrutledge.com>

Author: miketheman

readme_renderer/rst.py

@@ -27,7 +27,7 @@
 class ReadMeHTMLTranslator(HTMLTranslator):  # type: ignore[misc] # docutils is incomplete, returns `Any` python/typeshed#7256 # noqa E501
 
     # Overrides base class not to output `<object>` tag for SVG images.
-    object_image_types = {}  # type: ignore[var-annotated] # intentnionally empty
+    object_image_types: typing.Dict[str, str] = {}
 
     def emptytag(
         self,