Merge pull request #21 from SimonFrings/promise_v3

Forward compatibility with Promise v3

Author: clue

composer.json

@@ -25,7 +25,7 @@
         "react/child-process": "^0.6.3",
         "react/event-loop": "^1.2",
         "react/stream": "^1.2",
-        "react/promise": "^2.0 || ^1.0"
+        "react/promise": "^3.0 || ^2.0 || ^1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6 || ^5.7 || ^4.8.36"