Update MollieApiClient.php

Author: Naoray

src/MollieApiClient.php

@@ -56,7 +56,7 @@ class MollieApiClient
     /**
      * Version of our client.
      */
-    public const CLIENT_VERSION = "2.77.0";
+    public const CLIENT_VERSION = "2.78.0";
 
     /**
      * Endpoint of the remote API.