Bump ignore from 5.1.4 to 5.1.8 (#127)

Bumps [ignore](https://github.com/kaelzhang/node-ignore) from 5.1.4 to 5.1.8.
- [Release notes](https://github.com/kaelzhang/node-ignore/releases)
- [Changelog](https://github.com/kaelzhang/node-ignore/blob/master/CHANGELOG.md)
- [Commits](kaelzhang/node-ignore@5.1.4...5.1.8)

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