Documentation updates.

README.md

@@ -137,6 +137,8 @@ Your sound pack should include audio files for these events:
 - `post_sent` - User successfully posted
 - `timeline_update` - New posts in timeline
 - `notification` - General notification
+- `autocomplete` - Autocomplete suggestions available (optional)
+- `autocomplete_end` - Autocomplete interaction ended (optional)
 - `startup` - Application started (optional)
 - `shutdown` - Application closing (optional)
 - `expand` - Thread expanded (optional)
@@ -162,6 +164,8 @@ Create a `pack.json` file with this format:
     "post_sent": "sent.wav",
     "timeline_update": "update.wav",
     "notification": "notification.wav",
+    "autocomplete": "autocomplete.wav",
+    "autocomplete_end": "autocomplete_end.wav",
     "startup": "startup.wav",
     "shutdown": "shutdown.wav",
     "expand": "expand.wav",