Update to stable react-parallel

Author: WyriHaximus

composer.json

@@ -14,7 +14,7 @@
         "ext-parallel": "*",
         "react-parallel/contracts": "^1.0",
         "react-parallel/event-loop": "^1.0",
-        "react-parallel/react-parallel": "dev-master",
+        "react-parallel/react-parallel": "^1.0",
         "react/event-loop": "^1.1",
         "react/promise": "^2.7",
         "wyrihaximus/constants": "^1.5",