fix(deps): update dependency markdown-it-anchor to v5 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
markdown-it-anchor	dependencies	major	^4.0.0 -> ^5.0.0	source

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Release Notes

valeriangalliat/markdown-it-anchor

### [`v5.0.2`](https://togithub.com/valeriangalliat/markdown-it-anchor/blob/master/CHANGELOG.md#​502---2018-06-16) [Compare Source](https://togithub.com/valeriangalliat/markdown-it-anchor/compare/v5.0.1...v5.0.2) - Patch to fix ([#​35]) ### [`v5.0.1`](https://togithub.com/valeriangalliat/markdown-it-anchor/blob/master/CHANGELOG.md#​501---2018-06-14) [Compare Source](https://togithub.com/valeriangalliat/markdown-it-anchor/compare/v5.0.0...v5.0.1) - `trim()` before `toLowerCase()` to prevent dashes as prefixes and suffixes. ### [`v5.0.0`](https://togithub.com/valeriangalliat/markdown-it-anchor/blob/master/CHANGELOG.md#​500---2018-06-14) [Compare Source](https://togithub.com/valeriangalliat/markdown-it-anchor/compare/v4.0.0...v5.0.0) - NEW Contributor: nagaozen - Drop `string` package in favour of `encodeURIComponent`. Fixes: [#​44], [#​43], [#​38], [#​17]. Obsoletes [#​45].

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