Update dependency camelcase to v6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
camelcase	devDependencies	major	5.3.1 -> 6.1.0

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Release Notes

sindresorhus/camelcase

### [`v6.1.0`](https://togithub.com/sindresorhus/camelcase/releases/v6.1.0) [Compare Source](https://togithub.com/sindresorhus/camelcase/compare/v6.0.0...v6.1.0) - Add [`locale`](https://togithub.com/sindresorhus/camelcase#locale) option ([#​75](https://togithub.com/sindresorhus/camelcase/issues/75)) [`a06c4d1`](https://togithub.com/sindresorhus/camelcase/commit/a06c4d1) ### [`v6.0.0`](https://togithub.com/sindresorhus/camelcase/releases/v6.0.0) [Compare Source](https://togithub.com/sindresorhus/camelcase/compare/v5.3.1...v6.0.0) ##### Breaking - Require Node.js 10 ([#​62](https://togithub.com/sindresorhus/camelcase/issues/62)) [`878bc44`](https://togithub.com/sindresorhus/camelcase/commit/878bc44) Note: If you need to support Firefox, stay on version 5 as version 6 uses regex features not available in Firefox. ##### Improvements - Handle Unicode character casing ([#​62](https://togithub.com/sindresorhus/camelcase/issues/62)) [`878bc44`](https://togithub.com/sindresorhus/camelcase/commit/878bc44)

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