Update documentation links

Author: Neob91

NEWS.rst

@@ -2,6 +2,6 @@ IMAPClient's release history is now part of the main
 documentation_. See the `release documentation`_ on `Read the Docs`_ for
 the most up-to-date details of IMAPClient's releases.
 
-.. _documentation: http://imapclient.readthedocs.io/en/latest/
-.. _release documentation: http://imapclient.readthedocs.io/en/latest/releases.html
+.. _documentation: https://imapclient.readthedocs.io/en/master/
+.. _release documentation: https://imapclient.readthedocs.io/en/master/#release-history
 .. _Read the Docs: http://readthedocs.org