chore: update README for 1.1.0 release

README.md

@@ -65,6 +65,7 @@ All listed benefits below only apply to sponsors who donate **before** we reach
 
 - Get a sponsor license, which can be used to unlock some nice-to-have features in the free release version. Currently, the following features are available:
   - Theme color editor (to tweak a specific color in a theme)
+  - Customizable context menu (for the editor area)
 - Get credited within the blog of the next release
 
 ### Tier 1: 10 USD

README.zh_CN.md

@@ -65,6 +65,7 @@
 
 - 获得赞助者许可证，可供在免费发布的版本中解锁一些赞助者限定的锦上添花的小功能，目前包括：
   - 主题颜色编辑器（可供微调某个主题中的特定颜色）
+  - 可自定义的右键菜单（供编辑器区域使用）
 - 在下次版本发布时的博客中署名致谢
 
 ### 档位 1: 50 CNY