update more links

Author: Kriechi

requirements.txt

@@ -1 +1 @@
-Sphinx==1.8.3
+Sphinx==3.1.2

source/contributing.rst

@@ -199,10 +199,12 @@ New Contributors
 If you are new or relatively new to Open Source, welcome! The Hyper project
 aims to be a gentle introduction to the world of Open Source. If you're
 concerned about how best to contribute, please consider mailing a maintainer or
-asking for help on IRC.
+asking for help on our `Gitter community`_.
 
 Please also check the :ref:`early-feedback` section.
 
+.. _Gitter community: https://gitter.im/python-hyper/community
+
 Security
 ~~~~~~~~
 

source/one-of-the-team.rst

@@ -71,4 +71,4 @@ Maintainers are stewards of culture, as much as they are of code.
 
 
 .. _GitHub organisation: https://github.com/python-hyper
-.. _contributors team: https://github.com/orgs/python-hyper/teams/contributors
+.. _contributors team: https://github.com/orgs/python-hyper/people

source/security.rst

@@ -143,5 +143,5 @@ distributors to patch their software.
 
 .. _tough and competent: https://www.youtube.com/watch?v=9zjAteaK9lM
 .. _Lukasa: mailto:[email protected]
-.. _HPACK Bomb: https://python-hyper.org/hpack/en/latest/security/CVE-2016-6581.html
-.. _DoS via unlimited stream insertion: https://python-hyper.org/priority/en/latest/security/CVE-2016-6580.html
+.. _HPACK Bomb: https://python-hyper.org/projects/hpack/en/latest/security/CVE-2016-6581.html
+.. _DoS via unlimited stream insertion: https://python-hyper.org/projects/priority/en/latest/security/CVE-2016-6580.html