Merge pull request #49 from reactphp-parallel/renovate/react-promise-3.x

Update dependency react/promise to v3

Author: WyriHaximus

composer.json

@@ -14,7 +14,7 @@
         "ext-parallel": "*",
         "react/async": "^4.2",
         "react/event-loop": "^1.5",
-        "react/promise": "^2.11",
+        "react/promise": "^2.11 || ^3.0",
         "reactivex/rxphp": "^2.0.12",
         "wyrihaximus/constants": "^1.6.0",
         "wyrihaximus/metrics": "^1.0 || ^2",