Fix broken link to adapters essay
@@ -1017,7 +1017,7 @@ library to use SSLv3::
num_pools=connections, maxsize=maxsize,
block=block, ssl_version=ssl.PROTOCOL_SSLv3)
-.. _`described here`: https://www.kennethreitz.org/essays/the-future-of-python-http
+.. _`described here`: https://kenreitz.org/essays/2012/06/14/the-future-of-python-http
.. _`urllib3`: https://github.com/urllib3/urllib3
.. _blocking-or-nonblocking:
