Require guzzlehttp/promises v1.4

Author: simPod

composer.json

@@ -22,7 +22,7 @@
     },
     "require": {
         "php-64bit": "^7.4",
-        "guzzlehttp/promises": "^1.3",
+        "guzzlehttp/promises": "^1.4",
         "psr/http-client": "^1.0",
         "psr/http-factory": "^1.0",
         "psr/http-message": "^1.0",