paulmillr / chokidar / 701 / 16

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Pull #669

travis-ci

Fix windows ignore when using anymatch@2

Fixes #668

Chokidar@2 includes anymatch@2 which has a (potentially) breaking change
as described in the changelog: https://github.com/micromatch/anymatch#change-log

When the `cwd` is set Chokidar will join the ignore pattern to the cwd,
and if this isn't absolute, it causes `anymatch` to fail:

```js
// where cwd = c:\Users\remy\
anymatch('C:\\Users\\remy\\**\\node_modules\\**',
'C:\\Users\\remy\\node_modules\\project'); // === false
```

https://runkit.com/embed/rn05fobk294p

So this change adds the upath module (used by Chokidar during testing
and about 35K footprint) to normalize the path to bash-like slashes
which corrects the issue.

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