Revise release notes in README.md

Updated release notes for version 4.0 and 3.0.

README.md

@@ -5,6 +5,9 @@ The TeleVuer library is a specialized version of the Vuer library, designed to e
 Currently, this module serves as a core component of the [xr_teleoperate](https://github.com/unitreerobotics/xr_teleoperate) library, offering advanced functionality for teleoperation tasks. It supports various XR devices, including Apple Vision Pro, Meta Quest3, Pico 4 Ultra Enterprise etc., ensuring compatibility and ease of use for robotic teleoperation applications.
 
 ## Release Note
+V4.0 brings updates:
+0. Fix bugs.
+
 V3.0 brings updates:
 1. Added `pass_through` interface to enable/disable the pass-through mode.
 2. Support `webrtc` interface to enable/disable the webrtc streaming mode.
@@ -119,4 +122,4 @@ please refer to our wiki doc [XR Device](https://github.com/unitreerobotics/xr_t
 
 ## Notes
 - **Recommended Version**: Use `vuer==0.0.60` for the best functionality and stability.
-- **Black Screen Issue**: On PICO devices, choose the appropriate interaction method (hand gesture or controller) based on the mode to avoid black screen issues.
+- **Black Screen Issue**: On PICO devices, choose the appropriate interaction method (hand gesture or controller) based on the mode to avoid black screen issues.