Bring our portability statement into the present.

Author: tshead2

docs/portability.rst

@@ -7,18 +7,17 @@
 Portability
 ===========
 
-Past versions of Toyplot up-to 0.18 supported Python 2 and Python 3 with a
-single code base.  However, you should be aware that Python 2 will no longer be
-maintained past 2020 (https://pythonclock.org), and Toyplot is one of many
-projects to pledge an end to support for Python 2
-(https://python3statement.org).  In particular, Toyplot no longer supports
-Python 2 as of December 31st, 2018.
+Past versions of Toyplot supported Python 2 and Python 3 with a
+single code base.  However, Python 2 has not been maintained since 2020
+(https://pythonclock.org), and Toyplot is one of many projects that pledged to
+end support for Python 2 (https://python3statement.org).
 
 What this means
 ---------------
 
-The Toyplot 0.18 branch was the final release that included Python 2 support.
-Starting with Toyplot 0.19, portability code has been removed and our automated
-regression tests are only run using Python 3.  Of course, developers are free
-to continue working with the 0.18 branch if they need to support Python 2, and
-we will consider pull requests for the 0.18 branch on a case-by-case basis.
+Toyplot stopped supporting Python 2 on December 31st, 2018.  The Toyplot 0.18
+branch was the final release that included Python 2 support.  Starting with
+Toyplot 0.19, the portability code was removed and our automated regression
+tests are only run using Python 3.  Of course, developers are free to continue
+working with the 0.18 branch if they need to support Python 2, and we will
+consider pull requests for the 0.18 branch if they arise.