Issue with Url-analysis before file writing

Hi, Leon. I have an issue with converting post urls in static files when the permalinks are setted without slash at the end of post/page slug. In src/Crawler I found possible cause of this bug: https://github.com/leonstafford/wp2static/blob/develop/src/Crawler.php#L150 i.e without end-slash Crawler's code recognizes such post link as file without extension. In old version(6.x) of plugin this logic contains php function `pathinfo()` which performs this task more accurately.