Applied fixes from StyleCI

src/Guzzle6Promise.php

@@ -61,7 +61,7 @@ public function __construct(PromiseInterface $promise, RequestInterface $request
             } elseif ($reason instanceof GuzzleExceptions\GuzzleException) {
                 $this->state = self::REJECTED;
                 $this->exception = $this->handleException($reason, $request);
-            } elseif($reason instanceof \Exception) {
+            } elseif ($reason instanceof \Exception) {
                 throw new \RuntimeException('Invalid exception returned from Guzzle6', 0, $reason);
             } else {
                 throw new \UnexpectedValueException('Reason returned from Guzzle6 must be an Exception', 0, $reason);