Drop return typehints for 5.6

Author: Xerkus

src/AbstractFactory/ReflectionBasedAbstractFactory.php

@@ -137,7 +137,7 @@ public function canCreate(ContainerInterface $container, $requestedName)
         return class_exists($requestedName) && $this->canCallConstructor($requestedName);
     }
 
-    private function canCallConstructor(string $requestedName) : bool
+    private function canCallConstructor($requestedName)
     {
         $constructor = (new ReflectionClass($requestedName))->getConstructor();
 

test/AbstractFactory/ReflectionBasedAbstractFactoryTest.php

@@ -51,7 +51,7 @@ public function testCanCreateReturnsFalseWhenConstructorIsPrivate()
         );
     }
 
-    public function testCanCreateReturnsTrueWhenClassHasNoConstructor() : void
+    public function testCanCreateReturnsTrueWhenClassHasNoConstructor()
     {
         self::assertTrue(
             (new ReflectionBasedAbstractFactory())->canCreate(