env: update 0.7.1 README

Author: ytaek

packages/vscode/README.md

@@ -32,6 +32,11 @@ This extension contributes the following settings:
 Calling out known issues can help limit users opening duplicate issues against your extension. -->
 
 ## Release Notes
+### 0.7.1
+- Theme Selector!
+- Optimized UI Rendering
+- Boost up second Loading
+
 ### 0.7.0
 - UI enhancement
 - Patches for UI bugs