chore(deps): update dependency strip-ansi to v6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
strip-ansi	devDependencies	major	5.2.0 -> 6.0.0

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Release Notes

chalk/strip-ansi

### [`v6.0.0`](https://togithub.com/chalk/strip-ansi/releases/v6.0.0) [Compare Source](https://togithub.com/chalk/strip-ansi/compare/v5.2.0...v6.0.0) ##### Breaking - Require Node.js 8 [`976f459`](https://togithub.com/chalk/strip-ansi/commit/976f459) ##### Breaking for TypeScript users - Only use a CommonJS export for the TypeScript definition You need to change `import stripAnsi from 'strip-ansi';` to `import stripAnsi = require('strip-ansi');`

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:tada: This PR is included in version 4.1.1 :tada:

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