As reading Issues section in Readme "Does not work with ExtEventLoop. (So don't install php70-event, but you can try LibEventLoop php56-libevent)" But seems like when I tried with PHP 7.4 with EventLoop it shows that works.  
As reading Issues section in Readme
"Does not work with ExtEventLoop. (So don't install php70-event, but you can try LibEventLoop php56-libevent)"
But seems like when I tried with PHP 7.4 with EventLoop it shows that works.