chore: clean `package.json`

chore: build

Merge pull request picocss#346 from picocss/dev

v1.5.9

Merge pull request picocss#345 from picocss/dev

v1.5.8

Merge pull request picocss#289 from picocss/dev

v1.5.7

Merge pull request picocss#244 from picocss/dev

v1.5.6

Merge pull request picocss#239 from picocss/dev

v1.5.5

Merge pull request picocss#231 from picocss/dev

v1.5.4

Merge pull request picocss#200 from picocss/dev

v1.5.3

Merge pull request picocss#198 from picocss/dev

v1.5.2