README: Update checklist with new features and new TODOs

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

README.md

@@ -16,13 +16,17 @@ file.
 - [x] Join
   * [x] Normal sessions
   * [x] MSN
-- [ ] Presence
+- [-] Presence
-  * [x] Updates
   * [x] Resync
-  * [ ] Probes (storing updates to answer probes)
+  * [ ] Updates
+  * [-] Probes (storing updates to answer probes)
+    - Storing presences but not answering when they're being queried, yet.
   * [ ] Nick changes
-- [ ] Iq
+- [-] Iq
-  * [ ] Ping answers
+  * [-] Ping answers
+    - [x] Ping component (always succeeds)
+    - [-] Ping room (always fails. Awaiting affiliation support)
+    - [x] Ping participant (0410)
   * [ ] Ping probes?
   * [ ] Routing Public PEP?
   * [x] Default "service-unavailable"
@@ -46,6 +50,7 @@ file.
   * [ ] Presence versioning (0436)
   * [ ] Room Activity Indicator (0437)
   * [ ] Affiliation versioning (0463)
+  * [ ] Caching participant caps
 
 ### Storage