Replace pypi version badge badge.fury.io -> img.shields.io badge was blocked by privacy badger due to third party cookie. Replace with one that doesn't use cookies. Also add some other badges I may want to implement: supported python versions licenses used status beta, stable etc. mozilla observatory

try:
    # Python 3+
    from ssl import SSLError
except (ImportError, AttributeError):
    # Python 2.5-2.7
    from socket import sslerror as SSLError