dicttoolz.update_in

[hunterhogan]

humpy_toolz

• Docstring: update and expand.
• Tests: annotate.
• Tests: expand.

humpy_cytoolz

• .pyx file: add primary signature as first line of docstring.
• .pyx file: match docstring to humpy_toolz.
• .pyi file: add overload definitions.

When complete

• Add to list of pull requests for pytoolz/cytoolz.
• Add to list of pull requests for pytoolz/toolz.
• If needed, pull request to mgrinshpon/toolz-stubs.