Some Unicode char were not accounted for in indent

[toastal]

Only some of the Unicode characters worked some of the time. This helps fix some of those indentation issue. I'm not a VimL RegExp expert, so I'll be testing this branch locally for a while.

Checklist:

• [x] Briefly described the change
• [ ] Opened an issue before investing a significant amount of work into changes
• [ ] Updated README.md with any new configuration options and behavior
• [x] Updated CHANGELOG.md with the proposed changes
• [ ] Ran generate-doc.sh to re-generate the documentation

[i-am-the-slime]

@toastal Why shouldn't I merge this?

[toastal]

I don't think there are any issues.