Fix

Author: ondrejmirtes

composer.json

@@ -11,7 +11,7 @@
 		"jakub-onderka/php-parallel-lint": "^0.9.2",
 		"phing/phing": "^2.16.0",
 		"phpstan/extension-installer": "^1.0",
-		"phpstan/phpstan": "^0.12.19",
+		"phpstan/phpstan": "^0.12.20",
 		"phpstan/phpstan-strict-rules": "^0.12",
 		"phpunit/phpunit": "^6.3",
 		"slevomat/coding-standard": "^4.7.2",