Update README.md

Author: dtjm

README.md

@@ -6,16 +6,20 @@ TCP Server
 ----------
 **server.php**
 
-    $server = new \Async\TCPServer("tcp://0.0.0.0:4000");
-    $server->onConnect(function(){
-        echo "A client connected\n";
-    });
-    $server->onData(function($data){
-        echo "Client said: $data\n";
-    });
+```php
+$server = new \Async\TCPServer("tcp://0.0.0.0:4000");
+$server->onConnect(function(){
+    echo "A client connected\n";
+});
+$server->onData(function($data){
+    echo "Client said: $data\n";
+});
 
-    $server->run();
+$server->run();
+```
 
 Then you can do this:
 
-    # telnet localhost 4000
+```bash
+# telnet localhost 4000
+```