fix uniontype introspection bug

Author: shmax

src/Type/Definition/UnionType.php

@@ -87,7 +87,9 @@ public function getTypes()
                 );
             }
 
-            $this->types = $types;
+            $this->types = array_map(function($type) {
+            	return Type::resolveLazyType($type);
+			},$types);
         }
 
         return $this->types;

src/Type/Schema.php

@@ -424,7 +424,7 @@ private function getPossibleTypeMap()
                     }
                 } elseif ($type instanceof UnionType) {
                     foreach ($type->getTypes() as $innerType) {
-                        $this->possibleTypeMap[$type->name][$innerType->name] = Type::resolveLazyType($innerType);
+						$this->possibleTypeMap[$type->name][$innerType->name] = $innerType;
                     }
                 }
             }