Fix #21: Add gzip compression example

README.md

@@ -78,6 +78,13 @@ $curl->delete('http://api.example.com/user/', array(
 ));
 ```
 
+```php
+// Enable gzip compression.
+$curl = new Curl();
+$curl->setOpt(CURLOPT_ENCODING , 'gzip');
+$curl->get('https://www.example.com/image.png');
+```
+
 ```php
 $curl->close();
 ```