Reverted one minor breaking change

UPGRADE.md

@@ -39,46 +39,6 @@ GraphQL\Schema::$queryType;
 So if you rely on any protected properties or methods of any GraphQL class, make sure to 
 delete leading underscores.
 
-### 3. Returning closure from field resolver
-Previously when you returned closure from any resolver, expected signature of this closure
-was `function($sourceValue)`, new signature is `function($args, $context)` 
-(now mirrors reference graphql-js implementation)
-
-Before the change:
-```php
-new ObjectType([
-    'name' => 'Test',
-    'fields' => [
-        'a' => [
-            'type' => Type::string(),
-            'resolve' => function() {
-                return function($value) {
-                    return 'something';
-                }
-            }
-        ]
-    ]
-])
-
-```
-After the change:
-```php
-new ObjectType([
-    'name' => 'Test',
-    'fields' => [
-        'a' => [
-            'type' => Type::string(),
-            'resolve' => function() {
-                return function($args, $context) {
-                    return 'something';
-                }
-            }
-        ]
-    ]
-])
-```
-(note the closure signature change)
-
 ## Upgrade v0.6.x > v0.7.x
 
 There are a few new breaking changes in v0.7.0 that were added to the graphql-js reference implementation 

src/Executor/Executor.php

@@ -675,7 +675,7 @@ class Executor
             }
         }
 
-        return $property instanceof \Closure ? $property($args, $context) : $property;
+        return $property instanceof \Closure ? $property($source, $args, $context) : $property;
     }
 
     /**

tests/Executor/TestClasses.php

@@ -107,7 +107,7 @@ class Adder
     {
         $this->num = $num;
 
-        $this->test = function($args, $context)  {
+        $this->test = function($source, $args, $context)  {
             return $this->num + $args['addend1'] + $context['addend2'];
         };
     }