Fixed undefined constant

Author: mazanax

lib/Client.php

@@ -166,7 +166,7 @@ public function makeRequest($method, $url, $body = null, $headers = null)
         $responseHeaders = substr($response, 0, $headerSize);
 
         $responseHeaders = explode("\n", $responseHeaders);
-        $responseHeaders = array_map(trim, $responseHeaders);
+        $responseHeaders = array_map('trim', $responseHeaders);
 
         curl_close($curl);