SDL_ttf: Added a note to create a new milestone after release

From 13152c6f9b075fcf994962e246ac00db543e3d87 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 7 Jul 2022 11:40:41 -0700
Subject: [PATCH] Added a note to create a new milestone after release

---
 release_checklist.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/release_checklist.md b/release_checklist.md
index 81c5764..f5a272f 100644
--- a/release_checklist.md
+++ b/release_checklist.md
@@ -77,6 +77,8 @@
 
 * Run test/versioning.sh to verify that everything is consistent
 
+* Add a new milestone for issues
+
 ## New development prerelease
 
 * Bump version number from 2.Y.Z to 2.Y.(Z+1) (Y is odd)