Fixed imports

Author: GrahamCampbell

src/Client.php

@@ -13,6 +13,7 @@
 
 use GuzzleHttp\Client as GuzzleClient;
 use GuzzleHttp\ClientInterface;
+use GuzzleHttp\Exception\ConnectException;
 use GuzzleHttp\Exception\TransferException;
 use GuzzleHttp\HandlerStack;
 use GuzzleHttp\Middleware;