chore(deps): update dependency commitizen to v4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
commitizen	devDependencies	major	^3.0.0 -> ^4.0.0

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Release Notes

commitizen/cz-cli

### [`v4.0.2`](https://togithub.com/commitizen/cz-cli/releases/v4.0.2) [Compare Source](https://togithub.com/commitizen/cz-cli/compare/v4.0.1...v4.0.2) ##### Bug Fixes - **deps:** update dependency lodash to v4.17.15 ([#​652](https://togithub.com/commitizen/cz-cli/issues/652)) ([129a779](https://togithub.com/commitizen/cz-cli/commit/129a779)) ### [`v4.0.1`](https://togithub.com/commitizen/cz-cli/releases/v4.0.1) [Compare Source](https://togithub.com/commitizen/cz-cli/compare/v4.0.0...v4.0.1) ##### Bug Fixes - dep updates ([#​650](https://togithub.com/commitizen/cz-cli/issues/650)) ([c48bfb4](https://togithub.com/commitizen/cz-cli/commit/c48bfb4)) ### [`v4.0.0`](https://togithub.com/commitizen/cz-cli/releases/v4.0.0) [Compare Source](https://togithub.com/commitizen/cz-cli/compare/v3.1.2...v4.0.0) ##### Bug Fixes - **node:** remove node 6 and 8 support ([#​649](https://togithub.com/commitizen/cz-cli/issues/649)) ([8931c6b](https://togithub.com/commitizen/cz-cli/commit/8931c6b)) ##### BREAKING CHANGES - **node:** Removal of two major node versions, 6 and 8 from testing scheme

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