Fix to sanitize disqus shortnames to remove slashes [Security Issue]
Fix to sanitize disqus shortnames to remove slashes [Security Issue]

Signed-off-by: Max Wu <5423a0a0c940afd544cee330c672fe12652d7e4c@gmail.com>
hackmdio/hackmd,jackycute/HackMD,Yukaii/hackmd,jackycute/HackMD,Yukaii/hackmd,hackmdio/hackmd,hackmdio/hackmd,jackycute/HackMD,Yukaii/hackmd