Correct the type of CommunicationProvider's $responseBody property

To avoid warnings in the code, the `$responseBody` property should be an *object* and not a *string*. This is because it is set in `->callRestAPI()` with a `json_decode()`, which returns an object.

Author: patacra

src/Supporting/CommunicationProvider.php

@@ -120,7 +120,7 @@ class CommunicationProvider
      */
     public $returnedCount = 0;
     /**
-     * @var string
+     * @var object
      * @ignore
      */
     public $responseBody;
@@ -893,4 +893,4 @@ private function _json_urlencode($value)
 
         return $str;
     }
-}
+}