Add Ability to setup custom user-agent (#18)

Author: zyuhel

readme.md

@@ -54,4 +54,10 @@ Feed::$cacheDir = __DIR__ . '/tmp';
 Feed::$cacheExpire = '5 hours';
 ```
 
+You can setup a User-Agent if needed:
+
+```php
+Feed::$userAgent = "FeedFetcher-Google; (+http://www.google.com/feedfetcher.html)";
+```
+
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src/Feed.php

@@ -15,6 +15,9 @@ class Feed
 	/** @var string */
 	public static $cacheDir;
 
+	/** @var string */
+	public static $userAgent = 'FeedFetcher-Google';
+
 	/** @var SimpleXMLElement */
 	protected $xml;
 
@@ -208,8 +211,7 @@ private static function httpRequest($url, $user, $pass)
 			if ($user !== null || $pass !== null) {
 				curl_setopt($curl, CURLOPT_USERPWD, "$user:$pass");
 			}
-			$user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36";
-			curl_setopt($curl, CURLOPT_USERAGENT, $user_agent); // some feeds require a user agent
+			curl_setopt($curl, CURLOPT_USERAGENT, self::$userAgent); // some feeds require a user agent
 			curl_setopt($curl, CURLOPT_HEADER, false);
 			curl_setopt($curl, CURLOPT_TIMEOUT, 20);
 			curl_setopt($curl, CURLOPT_ENCODING, '');