Remove deleteChar call, cause it's private (#94)

Author: obstschale

src/Terminal.php

@@ -34,7 +34,6 @@ public function on(string $eventName, callable $callable)
     public function onKeyPress(callable $callable)
     {
         $this->io->once('data', function ($line) use ($callable) {
-            $this->getReadline()->deleteChar(0);
             $callable(trim($line));
         });