Removed descr from command props

examples/basic.php

@@ -30,7 +30,7 @@ $myShell->setPrompt("test>");
 $ctx = $myShell->createContext("root");
 $ctx->addCommand("hello", function () {
     echo "Hello World!\n";
-}, [ 'descr'=>'Say hello' ]);
+}, [ 'help'=>'Say hello' ]);
 
 // Run the shell
 $myShell->run();