upgrade phpstan

composer.json

@@ -23,7 +23,7 @@
 		"grifart/scaffolder": "^0.6.0",
 		"nette/tester": "^2.0.0",
 		"mockery/mockery": "^1.0.0",
-		"phpstan/phpstan": "^0.12",
+		"phpstan/phpstan": "^1.4",
 		"php-parallel-lint/php-parallel-lint": "^1.0",
 		"php-parallel-lint/php-console-color": "^1.0",
 		"brick/date-time": "^0.2.1"