readme.md: fixed TypeAssert example path

Author: dg

readme.md

@@ -58,8 +58,9 @@ For Nette package developers: `TypeAssert` lets you verify type inference in tes
 ```php
 use Nette\PHPStan\Tester\TypeAssert;
 
-TypeAssert::assertTypes(__DIR__ . '/data/types.php', [__DIR__ . '/../extension.neon']);
-TypeAssert::assertNoErrors(__DIR__ . '/data/clean.php', [__DIR__ . '/../extension.neon']);
+$extensions = [__DIR__ . '/../../vendor/nette/phpstan-rules/extension-utils.neon'];
+TypeAssert::assertTypes(__DIR__ . '/data/types.php', $extensions);
+TypeAssert::assertNoErrors(__DIR__ . '/data/clean.php', $extensions);
 ```
 
 The data file uses `assertType()` from PHPStan: