Fix unicode checks for fallbacks with test

[moranje]

Test passes. Also I noticed two things when I cloned project from scratch:

• The package in it's current form has 268 security vulnerabilities npm audit fix --force (which only seems to update jest) leaves two.
• The project may benefit from prettier (I have a prettier running in the background on every project by default and it tries to eliminate inconsistencies in the files. I've tried to create a .prettierrc that would have the least amount of changes which seems to be:

{
  "printWidth": 80,
  "tabWidth": 2,
  "useTabs": false,
  "semi": false,
  "singleQuote": true,
  "trailingComma": "es5",
  "bracketSpacing": false,
  "arrowParens": "avoid"
}

I'd be willing to create pull-requests for these changes if you would welcome these.

[tjvr]

Yeah, NPM always seems to have audit failures because I don't upgrade dependencies very often. Which is silly, since Moo itself has no dependencies 🙂 A PR to upgrade the deps would be most welcome.

I've thought about adding prettier before, and possibly have a branch somewhere. It might be worth it (I really like go fmt, which it appears to emulate).

I'll try and review this PR later, thanks 😊

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