fix(demojify): Do not remove U+0023 # Number Sign

[mikesmithgh]

👋 I noticed that the # number symbol is being removed as if it is an emoji.

See https://github.com/kdheepak/panvimdoc/pull/50 for additional information around the issue.

Please let me know what you think. Also, I noticed there isn't much activity of late, is this repo still maintained? Thanks!