SDK assumes scopes are required (#3)

Refresh token calls fail if no scopes are passed.

lib/Auth/TokenFetcher.php

@@ -71,13 +71,10 @@ public function __construct(
      * @param array $scopes
      * @param array $additionalParams
      * @return array
-     * @throws LogicException
      * @throws RuntimeException
      */
     public function fetch($url, $grantType, array $scopes, array $additionalParams = [])
     {
-        $this->validateScopesNotEmpty($scopes);
-
         $formParams = array_merge([
             'client_id'     => $this->configuration->getClientId(),
             'client_secret' => $this->configuration->getClientSecret(),
@@ -92,17 +89,6 @@ public function fetch($url, $grantType, array $scopes, array $additionalParams =
         return json_decode($response, true);
     }
 
-    /**
-     * @param array $scopes
-     * @throws LogicException
-     */
-    public function validateScopesNotEmpty(array $scopes)
-    {
-        if (count($scopes) === 0) {
-            throw new LogicException('Cannot fetch token when no scopes where defined');
-        }
-    }
-
     /**
      * @param $url
      * @param $body
@@ -124,4 +110,4 @@ private function makeRequest($url, $body)
 
         return (string)$response->getBody();
     }
-}
+}