update progurad rules

Author: lemon

README.md

@@ -108,6 +108,9 @@ You can set your policy according to the current page's url and the parameters y
    -keepclassmembers class tech.easily.easybridge.lib.EasyBridge{
        public *;
    }
+   -keepclassmembernames class tech.easily.easybridge.lib.CallBackMessage{
+       <fields>;
+   }
    ```
 
 # <a name="README_CN">功能</a>
@@ -216,6 +219,9 @@ EasyBridge提供两种安全检查策略。其中全局的安全检查在EasyBri
    -keepclassmembers class tech.easily.easybridge.lib.EasyBridge{
        public *;
    }
+   -keepclassmembernames class tech.easily.easybridge.lib.CallBackMessage{
+       <fields>;
+   }
    ```
 
 # EasyBridge

app/proguard-rules.pro

@@ -21,4 +21,7 @@
 #-renamesourcefileattribute SourceFile
 -keepclassmembers class tech.easily.easybridge.lib.EasyBridge{
     public *;
+}
+-keepclassmembernames class tech.easily.easybridge.lib.CallBackMessage{
+    <fields>;
 }

app/src/main/assets/demo.html

@@ -19,7 +19,9 @@
             }, false);
 
         function toast(params) {
-            window.easyBridge.callHandler('toast', 'toast with:' + params + 'at ' + new Date().toLocaleString());
+            window.easyBridge.callHandler('toast', 'toast with:' + params + 'at ' + new Date().toLocaleString(),function(result){
+                console.log('receive data:'+result);
+            });
         }
 
         function jumpToPage(){

app/src/main/java/tech/easily/easybridge/handler/ToastHandler.kt

@@ -13,6 +13,6 @@ import tech.easily.easybridge.lib.handler.BaseBridgeHandler
 class ToastHandler(handlerName:String,webView: EasyBridgeWebView) : BaseBridgeHandler(handlerName,webView) {
     override fun onCall(parameters: String?, callBack: ResultCallBack?) {
         Toast.makeText(webView.context, parameters, Toast.LENGTH_SHORT).show()
-        callBack?.onResult(null)
+        callBack?.onResult("data send to js")
     }
 }