Pass python_requires argument to setuptools

Helps pip decide what version of the library to install.

https://packaging.python.org/tutorials/distributing-packages/#python-requires

> If your project only runs on certain Python versions, setting the
> python_requires argument to the appropriate PEP 440 version specifier
> string will prevent pip from installing the project on other Python
> versions.

https://setuptools.readthedocs.io/en/latest/setuptools.html#new-and-changed-setup-keywords

> python_requires
>
> A string corresponding to a version specifier (as defined in PEP 440)
> for the Python version, used to specify the Requires-Python defined in
> PEP 345.

setup.py

@@ -43,6 +43,7 @@ setup(
     packages=find_packages(exclude=["tests"]),
     include_package_data=True,
     install_requires=install_requires,
+    python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*",
     classifiers=CLASSIFIERS,
     zip_safe=False,
 )