Re-enable secure SSL in setup.py

[kislyuk]

Hi, I noticed that DendroPy disables SSL certificate verification globally in setup.py:

import ssl
if hasattr(ssl, '_create_unverified_context'):
    ssl._create_default_https_context = ssl._create_unverified_context

It seems this workaround should no longer be necessary. Can it be removed to avoid any doubts about security at install time?

[jeetsukumaran]

No longer necessary universally, or no longer necessary for particular/latest versions of Python, OS, etc.?

[kislyuk]

Disabling SSL security is not necessary in any supported configuration of Python or its host OS that I'm aware of.