flutter_geetest_plugin_backendjson 0.0.7

A new flutter plugin project.

flutter_geetest_plugin_backendjson

flutter 极验 行为验证 插件 ，用法详见example包main.dart 此版本后端请求API content-type为application/json

E.g

 api2 request body:
 {
	"geetestSeccode": "",
	"geetest_challenge": "",
	"geetest_validate": ""
 }