Pluggable executor implementations; new faster executor using coroutines

Author: jakubkulhan

.gitignore

@@ -1,4 +1,5 @@
-composer.phar
+.phpcs-cache
 composer.lock
+composer.phar
 phpcs.xml
 vendor/

composer.json

@@ -20,7 +20,7 @@
   "config": {
     "preferred-install": "dist",
     "sort-packages": true
-},
+  },
   "autoload": {
     "psr-4": {
       "GraphQL\\": "src/"

src/Executor/ExecutionResult.php

@@ -57,7 +57,7 @@ class ExecutionResult implements \JsonSerializable
      * @param Error[] $errors
      * @param mixed[] $extensions
      */
-    public function __construct(?array $data = null, array $errors = [], array $extensions = [])
+    public function __construct($data = null, array $errors = [], array $extensions = [])
     {
         $this->data       = $data;
         $this->errors     = $errors;