Add new docs filetypes to manifest.in
@@ -24,6 +24,7 @@ exclude noxfile.py
recursive-include src/pip/_vendor *.pem
recursive-include src/pip/_vendor py.typed
recursive-include docs *.css *.py *.rst *.md
+recursive-include docs *.dot *.png
exclude src/pip/_vendor/six
exclude src/pip/_vendor/six/moves
