fixup! Specify which Python versions are actually supported and tested

Author: blogh

README.md

@@ -34,8 +34,8 @@ pg\_activity releases. Before submitting a bug report here:
 
 ## From PyPI
 
-pg\_activity can be installed using pip on Python 3.8 or later along with
-psycopg:
+pg\_activity can be installed using pip on Python 3.8 or later (see below) along
+with psycopg:
 
     $ python3 -m pip install "pg_activity[psycopg]"