Compare file path with same separators

Transform both file paths to have similar path delimiters before comparing them.
Proposed solution to issue #54

src/FileMatchers/EndsWith.php

@@ -38,6 +38,9 @@ protected function fileEndsWith($haystack, $needle)
             return $this->fileEndsWith($needle, $haystack);
         }
 
+        $haystack = str_replace('\\', '/', $haystack);
+        $needle = str_replace('\\', '/', $needle);
+
         return (substr($haystack, -$length) === $needle);
     }
 }