Default Curl::setProxyTunnel() to enable tunneling; Use Curl::setProxyTunnel() in proxy example

README.md

@@ -273,7 +273,7 @@ Curl::setOpts($options)
 Curl::setPort($port)
 Curl::setProxy($proxy, $port = null, $username = null, $password = null)
 Curl::setProxyAuth($auth)
-Curl::setProxyTunnel($tunnel)
+Curl::setProxyTunnel($tunnel = true)
 Curl::setProxyType($type)
 Curl::setReferer($referer)
 Curl::setReferrer($referrer)

examples/proxy.php

@@ -5,6 +5,6 @@ use \Curl\Curl;
 
 $curl = new Curl();
 $curl->setProxy('someproxy.com', '9999', 'username', 'password');
-$curl->setOpt(CURLOPT_HTTPPROXYTUNNEL, 1);
+$curl->setProxyTunnel();
 $curl->get('https://httpbin.org/get');
 var_dump($curl->response);

src/Curl/Curl.php

@@ -1071,7 +1071,7 @@ class Curl
      * @access public
      * @param  $tunnel boolean
      */
-    public function setProxyTunnel($tunnel)
+    public function setProxyTunnel($tunnel = true)
     {
         $this->setOpt(CURLOPT_HTTPPROXYTUNNEL, $tunnel);
     }