Fix requires at least to match plugin header

jdevalk · jdevalk · commit 7388b81e4960 · 2025-11-13T09:59:02.000+01:00
diff --git a/readme.txt b/readme.txt
@@ -1,7 +1,7 @@
 === Progress Planner ===
 Contributors: joostdevalk, aristath, filipi, jonoaldersonwp, mariekerakt, irisguelen, samalderson, tacoverdo
 Tags: planning, maintenance, writing, blogging
-Requires at least: 6.3
+Requires at least: 6.6
 Tested up to: 6.8
 Requires PHP: 7.4
 Stable tag: 1.9.0
