Fix build

Author: ondrejmirtes

composer.json

@@ -7,7 +7,7 @@
 	],
 	"require": {
 		"php": "~7.1",
-		"phpstan/phpstan": "^0.12.6"
+		"phpstan/phpstan": "^0.12.24"
 	},
 	"require-dev": {
 		"consistence/coding-standard": "^3.7",

tests/Type/WebMozartAssert/AssertTypeSpecifyingExtensionTest.php

@@ -165,7 +165,7 @@ public function testExtension(): void
 				126,
 			],
 			[
-				'Variable $things is: array(\'foo\' => string, \'bar\' => string)',
+				'Variable $things is: array(\'foo\' => string, ?\'bar\' => string)',
 				131,
 			],
 		]);