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travis-ci

chore(deps): css-tree@1.0.0-alpha.39, latest others (#409)

- regenerated `package-lock.json` from scratch. this fixed all `npm audit`'s security risks.
- replaced deprecated `rollup-plugin-*` with `@rollup/plugin-*`.
- added .nyc_output to gitignore, as "coverage" script creates it

845 of 866 branches covered (97.58%)

1198 of 1206 relevant lines covered (99.34%)

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