Add 2.7 and 3.7 EOL, update link to definitive source of EOL dates.

Steve Piercy

2018-10-09 9f70d5088e10ad4ec8f3f3644e07ee5e722277d8

Add 2.7 and 3.7 EOL, update link to definitive source of EOL dates.

 docs/narr/upgrading.rst

@@ -83,14 +83,13 @@
through the end of their lifespans. The end-of-life for a given version of
Python is when security updates are no longer released.

- `Python 3.2 Lifespan <https://www.python.org/dev/peps/pep-0392/#lifespan>`_
  ends February 2016.
- `Python 3.3 Lifespan <https://www.python.org/dev/peps/pep-0392/#lifespan>`_
  ends September 2017.
- `Python 3.4 Lifespan <https://www.python.org/dev/peps/pep-0429/>`_ TBD.
- `Python 3.5 Lifespan <https://www.python.org/dev/peps/pep-0478/>`_ TBD.
- `Python 3.6 Lifespan <https://www.python.org/dev/peps/pep-0494/#id4>`_
  December 2021.
- `Python 2.7 Lifespan <https://devguide.python.org/#status-of-python-branches>`_ 2020-01-01.
- `Python 3.2 Lifespan <https://www.python.org/dev/peps/pep-0392/#lifespan>`_ 2016-02-20.
- `Python 3.3 Lifespan <https://www.python.org/dev/peps/pep-0398/>`_ 2017-09-29.
- `Python 3.4 Lifespan <https://devguide.python.org/#status-of-python-branches>`_ 2019-03-16    .
- `Python 3.5 Lifespan <https://devguide.python.org/#status-of-python-branches>`_ 2020-09-13    .
- `Python 3.6 Lifespan <https://devguide.python.org/#status-of-python-branches>`_ 2021-12-23.
- `Python 3.7 Lifespan <https://devguide.python.org/#status-of-python-branches>`_ 2023-06-27    .

To determine the Python support for a specific release of Pyramid, view its
``tox.ini`` file at the root of the repository's version.