Update README.md

Author: rainliu

README.md

@@ -40,10 +40,11 @@
   - sync up to [pion/srtp/v1.5.2](https://github.com/pion/srtp/tree/071a6b95ab38e9eab9324dacd608dde1ec0c7cd3)
 - [x] DTLS
   - sync up to [pion/dtls/v2.0.0](https://github.com/pion/dtls/tree/789798433596e4dd92451b66984dddb2f8a9f165)
-- [ ] STUN
-  - work in progress
-  - catch up [pion/stun/v0.3.5](https://github.com/pion/stun/tree/7b20b792b7e18b3846032aaa80e8c0e2d412d0f8)
+- [x] STUN
+  - sync up to [pion/stun/v0.3.5](https://github.com/pion/stun/tree/7b20b792b7e18b3846032aaa80e8c0e2d412d0f8)
 - [ ] TURN
+  - work in progress
+  - catch up to [pion/turn/v2.0.2](https://github.com/pion/turn/tree/502d01577bf86a442ab9b9fa23f78987e7f1e1cd)
 - [ ] ICE
 - [ ] PeerConnection