Set python_requires='>=3.5'
Set python_requires='>=3.5'

Will prevent users with Python 2.7 or 3.4 from downloading a sdist
version they cannot build.
Also updated the description.

Note: supporting `python_requires` requires setuptools>=24.2.0 and pip>=9.0.0 to benefit from it.
Details here: https://packaging.python.org/guides/distributing-packages-using-setuptools/#python-requires

pycurl/pycurl,pycurl/pycurl,pycurl/pycurl