Add @types/unist to dependencies

[arcanis]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, I’ve added docs and tests

Description of changes

unist-util-is directly references the unist types (for example here), so it should list it as a dependency. Failing that, loose package managers like npm may generate incorrect hoisting, and strict package managers like Yarn or pnpm may cause TS to fail to resolve the dependency.

Seems related to #14

Fixes the following errors:

unist-util-is/index.d.ts(5,23): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/index.d.ts(8,23): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/index.d.ts(11,23): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(89,25): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(91,16): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(100,27): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(102,16): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(143,23): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(148,27): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(149,29): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(174,23): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(184,23): error TS2307: Cannot find module 'unist' or its corresponding type declarations.
unist-util-is/lib/index.d.ts(202,23): error TS2307: Cannot find module 'unist' or its corresponding type declarations.

[wooorm]

Thanks! I’ll get back to the repo in ±10 days as I’m on holiday. OK?

[wooorm]

Thanks!

[wooorm]

released in 5.2.1 :)