WhatsNew.txt: Note that minimum macOS version is now 10.9.
diff --git a/WhatsNew.txt b/WhatsNew.txt
index 9f41758..c058404 100644
--- a/WhatsNew.txt
+++ b/WhatsNew.txt
@@ -48,6 +48,9 @@ Linux:
* Added the hint SDL_HINT_LINUX_DIGITAL_HATS to control whether to treat hats as digital rather than checking to see if they may be analog
* Added the hint SDL_HINT_LINUX_HAT_DEADZONES to control whether to use deadzones on analog hats
+macOS:
+* Bumped minimum OS deployment version to macOS 10.9.
+
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2.0.22:
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