Update README.rst

Author: kislyuk

README.rst

@@ -14,7 +14,7 @@ payload security in `SAML 2.0 <http://en.wikipedia.org/wiki/SAML_2.0>`_ and
 * Support for exclusive XML canonicalization with inclusive prefixes (`InclusiveNamespaces PrefixList
   <http://www.w3.org/TR/xml-exc-c14n/#def-InclusiveNamespaces-PrefixList>`_, required to verify signatures generated by
   some SAML implementations)
-* Modern Python compatibility (2.7-3.8+ and PyPy)
+* Modern Python compatibility (3.5-3.9+ and PyPy)
 * Well-supported, portable, reliable dependencies: `lxml <https://github.com/lxml/lxml>`_,
   `cryptography <https://github.com/pyca/cryptography>`_, `eight <https://github.com/kislyuk/eight>`_,
   `pyOpenSSL <https://github.com/pyca/pyopenssl>`_