Hi , I would like to report that url is converted into lower-case. Hope you can fix this problem.

Original url: https://gist.githubusercontent.com/BBcan177/bf29d47ea04391cb3eb0/raw/f7b3779da1c490b57e9ad892534b36b3836afe61/MS-1

url after click Save button: https://gist.githubusercontent.com/bbcan177/bf29d47ea04391cb3eb0/raw/f7b3779da1c490b57e9ad892534b36b3836afe61/ms-1