Update README.md

edit readme known issues and feats.

README.md

@@ -176,12 +176,14 @@ For more examples, check the **[examples](examples)** directory.
 - [x] stabilize file downloading
 - [ ] secret chats support
 - [ ] cdn dc support
-- [ ] reimplement file downloads (more speed + less cpu usage)
+- [x] reply markup builder helpers
+- [x] reimplement file downloads (more speed + less cpu usage)
 
 ## known issues
 
-- [ ] ~ file download, is cpu intensive
+- [x] ~ file download, is cpu intensive
 - [x] ~ open issues if found :)
+- [ ] ~ enhance peer caching.
 
 ## contributing