chore: update min app version to latest Obsidian version

manifest.json

@@ -2,9 +2,9 @@
 	"id": "podnotes",
 	"name": "PodNotes",
 	"version": "1.10.0",
-	"minAppVersion": "0.12.0",
+	"minAppVersion": "0.15.9",
 	"description": "Helps you write notes on podcasts.",
 	"author": "Christian B. B. Houmann",
 	"authorUrl": "https://bagerbach.com",
 	"isDesktopOnly": false
-}
\ No newline at end of file
+}