typing is a Py35 backport; don't depend on it if you're above py35

[singingwolfboy]

From https://pypi.org/project/typing/:

NOTE: in Python 3.5 and later, the typing module lives in the stdlib, and installing this package has NO EFFECT, because stdlib takes higher precedence than the installation directory.

and

For package maintainers, it is preferred to use typing;python_version<"3.5" if your package requires it to support earlier Python versions. This will avoid shadowing the stdlib typing module when your package is installed via pip install -t . on Python 3.5 or later.

[yusra-ahmed-zz]

lgtm

[yusra-ahmed-zz]

please remember to cut a new version and update our requirements.txt file!