chore: update README.md

Author: ShrBox

README.md

@@ -2,26 +2,32 @@
 
 A plugin engine for running LLSE plugins on LeviLamina
 
-## Install
+## Installation
 
-To install all engines as a whole, you can use the following command:
+To install QuickJs and Lua engine, you can use the following command:
 
-```sh
+```shell
 lip install github.com/LiteLDev/LegacyScriptEngine
 ```
 
 To install a specific engine, you can use the following command:
 
-```sh
+```shell
 lip install gitea.litebds.com/LiteLDev/legacy-script-engine-lua
-
 lip install gitea.litebds.com/LiteLDev/legacy-script-engine-quickjs
-
 lip install gitea.litebds.com/LiteLDev/legacy-script-engine-nodejs
-
 lip install gitea.litebds.com/LiteLDev/legacy-script-engine-python
 ```
 
+To upgrade engines, you can use the following command:
+
+```shell
+lip install --upgrade gitea.litebds.com/LiteLDev/legacy-script-engine-lua
+lip install --upgrade gitea.litebds.com/LiteLDev/legacy-script-engine-quickjs
+lip install --upgrade gitea.litebds.com/LiteLDev/legacy-script-engine-nodejs
+lip install --upgrade gitea.litebds.com/LiteLDev/legacy-script-engine-python
+```
+
 ## Usage
 
 1. Put LLSE plugins directly in `/path/to/bedrock_dedicated_server/plugins/`。