Use existing HTTP client on Telegram initialisation if it has already been set.

CHANGELOG.md

@@ -13,6 +13,7 @@ Exclamation symbols (:exclamation:) note something of importance e.g. breaking c
 ### Removed
 ### Fixed
 - Don't output deprecation notices if no logging is enabled.
+- Respect custom HTTP Client initialisation, no matter when it is set.
 ### Security
 
 ## [0.59.0] - 2019-07-07

src/Request.php

@@ -264,7 +264,7 @@ class Request
         }
 
         self::$telegram = $telegram;
-        self::setClient(new Client(['base_uri' => self::$api_base_uri]));
+        self::setClient(self::$client ?: new Client(['base_uri' => self::$api_base_uri]));
     }
 
     /**