Update README.md

Author: socheatsok78

README.md

@@ -14,11 +14,13 @@ The action takes the following inputs:
     Available channels are `stable`, `beta`. See
     https://flutter.dev/docs/development/tools/sdk/releases for details.
 
-  * `version`: (Required) A specific SDK version, e.g. `3.0.2` or `3.1.0-9.0.pre`
+  * `version`: (Required) A specific SDK version, e.g. `latest` or `3.0.2` or `3.1.0-9.0.pre`
 
-  * `cache`: (Optional) Enable cache of the installed Flutter SDK. Default: false
+  * `cache`: (Optional) Enable cache of the pub dependencies. Default: false
 
-  * `cache-key`: (Optional) An explicit key for restoring and saving the Flutter SDK to/from cache
+  * `cache-sdk`: (Optional) Enable cache of the installed Flutter SDK. Default: false
+
+  * `cache-key`: (Optional) An explicit key for restoring and saving the pub dependencies to/from cache
 
 ## Basic example