File and directory name containing polish diactric characters causes 404 error.

[zbigniewzolnierowicz]

Steps to reproduce the bug: A folder containing an example directory called "zażółć gęślą jaźń" and a file named the same (but with the .md extension).

Expected behavior: I can properly open zażółć gęślą jaźń.md and the zażółć gęślą jaźń directory.

Occuring behavior: The server throws the following 404 errors:

For zażółć gęślą jaźń.md

404 :'( for /zażółć gęślą jaźń.md

For the zażółć gęślą jaźń directory

404 :'( for /zażółć gęślą jaźń/

There was a similar issue concerning Chinese characters that's been resolved - #17.

[F1LT3R]

I'm happy to review a PR for this if you have the time to work on this?

[F1LT3R]

@zbigniewzolnier you want to submit a PR for this? Because I don't speak/read/type in Polish, this would be difficult for me to fix and verify.