update doc

CHANGELOG.md

+## 0.5.0
+* 增加了对拉起小程序的支持
+* 删除了一些不必要的类
+* 发送Auth验证Api调整
+
+
 ## 0.4.1
 * 修复iOS与其他库共存时，会有重复的错误
 

doc/SEND_AUTH.md

@@ -2,10 +2,8 @@
 We'll get a `code` by sending auth:
 ```dart
    import 'package:fluwx/fluwx.dart' as fluwx;
-   fluwx.sendAuth(WeChatSendAuthModel(
-      scope: "snsapi_userinfo",
-          state:"wechat_sdk_demo_test",
-    ));
+   fluwx.sendAuth(
+         scope: "snsapi_userinfo", state: "wechat_sdk_demo_test")；
 ```
 Getting `access_token` is not supported by `fluwx`.
 

doc/SEND_AUTH_CN.md

@@ -2,10 +2,8 @@
 `Fluwx`目前只支持获取`code`，若要获取`access_token`请在服务器端完成。
 ```dart
    import 'package:fluwx/fluwx.dart' as fluwx;
-   fluwx.sendAuth(WeChatSendAuthModel(
-      scope: "snsapi_userinfo",
-          state:"wechat_sdk_demo_test",
-    ));
+   fluwx.sendAuth(
+         scope: "snsapi_userinfo", state: "wechat_sdk_demo_test")；
 ```
 ### 返回值处理
  `fluwx.share(model)`返回的是一个`Map`：

pubspec.yaml

 name: fluwx
 description: A implement of WeChatSDK on Flutter.Let's make it easier with Fluwx.
-version: 0.4.1
+version: 0.5.0
 author: JarvanMo <jarvan.mo@gmail.com>
 homepage: https://github.com/JarvanMo/fluwx