Mark classes as final to discourage inheritance

Author: clue

src/Client.php

@@ -12,7 +12,7 @@
 use \InvalidArgumentException;
 use RuntimeException;
 
-class Client implements ConnectorInterface
+final class Client implements ConnectorInterface
 {
     /**
      *

src/Server.php

@@ -15,7 +15,7 @@
 use \Exception;
 use React\Promise\Timer\TimeoutException;
 
-class Server
+final class Server
 {
     // the following error codes are only used for SOCKS5 only
     /** @internal */

src/StreamReader.php

@@ -9,7 +9,7 @@
 /**
  * @internal
  */
-class StreamReader
+final class StreamReader
 {
     const RET_DONE = true;
     const RET_INCOMPLETE = null;