cookie_token regex doesn't accept %

Hello, I've been using an older version of the bridge for a while, but when I upgraded last night I found that I can no longer login to slack. I pulled a new token and cookie and when logging in I receive the error: `Invalid value for cookie_token: doesn't match regex ^xoxd-[a-zA-Z0-9/+=]+$` My cookie_token (the one starting with xoxd) contains a few % characters in it, might this be the issue?