Improve exception when route cannot be matched

[Fowerld]

router/src/MetaRouter.php

Line 73 in 16f3313

throw new Exception('Unable to route request: no route matched requested URL', 404);

The idea would be to output the requested URL.

throw new Exception(sprintf('Unable to route request: no route matched requested URL \'%s\'', (string) $app->getRequest()->getUri()), 404);