Try running on ubuntu-22.04, add note about SQLite bug

Author: dcwatson

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: astral-sh/ruff-action@v3
 
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     services:
       postgres:
         image: postgres

.gitignore

@@ -11,3 +11,4 @@ dist
 .coverage
 htmlcov
 *.sh
+.python-version

README.md

@@ -6,9 +6,12 @@ that automatically record inserts, updates, and deletes to model tables.
 
 ## Requirements
 
-* Django 3.2+
+* Django 4.2+
 * PostgreSQL or SQLite database
 
+*Warning: there is a [bug](https://sqlite.org/forum/forumpost/ecb94cd210) in SQLite
+3.45.1 that causes JSON changes to be stored as strings. Unfortunately, this is the
+version that ships with Ubuntu 24.04.*
 
 ## Installation