message: Update README.md
  Remove `base on Swoole 2`
diff: @@ -16,7 +16,7 @@ Swoole is an event-driven asynchronous & concurrent networking communication fra
  Swoft
  ----
  -A modern, high performance AOP and coroutine PHP framework, based on Swoole 2. <https://github.com/swoft-cloud>
  +A modern, high performance AOP and coroutine PHP framework. <https://github.com/swoft-cloud>
  EasySwoole
  ----
  