Update README.md

[Ramishscrapper]

I update the readme code languages so the PHP code syntax highlight properly.

For example:

function test($string){
   return 'Hello ' . $string;
}

$sandbox = new PHPSandbox\PHPSandbox;
$sandbox->whitelistFunc('test');
$result = $sandbox->execute(function(){
   return test('world');
});

var_dump($result);  //Hello world

into

function test($string){
   return 'Hello ' . $string;
}

$sandbox = new PHPSandbox\PHPSandbox;
$sandbox->whitelistFunc('test');
$result = $sandbox->execute(function(){
   return test('world');
});

var_dump($result);  //Hello world

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