Bumps [node-gyp](https://github.com/nodejs/node-gyp) from 5.0.4 to 6.0.1.
- [Release notes](https://github.com/nodejs/node-gyp/releases)
- [Changelog](https://github.com/nodejs/node-gyp/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodejs/node-gyp/compare/v5.0.4...v6.0.1)
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