Update react/promise requirement

composer.json

@@ -35,7 +35,7 @@
         "symfony/filesystem": "^2.7 || ^3.0 || ^4.0",
         "symfony/finder": "^2.7 || ^3.0 || ^4.0",
         "symfony/process": "^2.7 || ^3.0 || ^4.0",
-        "react/promise": "^1.2"
+        "react/promise": "^1.2 || ^2.7"
     },
     "conflict": {
         "symfony/console": "2.8.38"

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "3243ce6f26231df34d1bceab1a148803",
+    "content-hash": "b078b12b2912d599e0c6904f64def484",
     "packages": [
         {
             "name": "composer/ca-bundle",