📝 Update README.

Author: AlexV525

README-ZH.md

@@ -60,7 +60,7 @@ Language: [English](README.md) | 中文简体
 
 ```yaml
 dependencies:
-  wechat_assets_picker: ^2.2.0
+  wechat_assets_picker: ^latest_version
 ```
 
 在你的代码中导入：

README.md

@@ -59,7 +59,7 @@ Althought the package provide selection for assets, it still require users build
 Add `wechat_assets_picker` to `pubspec.yaml` dependencies.
 ```yaml
 dependencies:
-  wechat_assets_picker: ^2.2.0
+  wechat_assets_picker: ^latest_version
 ```
 Then import the package in your code:
 ```dart