Add toString for HttpException

Author: yjfnypeu

updatepluginlib/src/main/java/org/lzh/framework/updatepluginlib/impl/HttpException.java

@@ -36,4 +36,12 @@ public int getCode() {
     public String getErrorMsg() {
         return errorMsg;
     }
+
+    @Override
+    public String toString() {
+        return "HttpException{" +
+                "code=" + code +
+                ", errorMsg='" + errorMsg + '\'' +
+                '}';
+    }
 }