chore: bump version

chore: release 0.6.0. happy new year!

feat: add positive zero guards, constants, and types (#9)

* feat(guards): add @nick/math/guards/positive-zero

* feat(constants): add @nick/constants/positive-zero

* chore: update ./constants root entrypoint

* refactor(guards): add positive-zero export to ./guards/mod.ts, improve docs

* config: update deno.json exports

* chore: pin dev deps and update scripts in deno.json

* config: update publish config and other stuff in deno.json

* chore: bump version