TypedDict not in py7

[Travis F. Collins]

Need to bump version or drop the typehint for TypedDict. It got introduced in py3.8

doctools/pyproject.toml

Line 36 in 58ed2bb

 requires-python = ">=3.7" 

[Jorge Marques]

Fixed in 8f73b0e, bumped pkg to 0.3.31 to trigger release (run)