build(deps-dev): bump auto-changelog from 1.16.4 to 2.2.1

Created by: Tirokk

Authored by dependabot-preview[bot] Sep 19, 2020

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Bumps auto-changelog from 1.16.4 to 2.2.1.

Changelog

Sourced from auto-changelog's changelog.

v2.2.1

• Remove requirement for --latest-version to be valid semver [#178](https://github.com/CookPete/auto-changelog/issues/178)
• Mild refactor 1fc916c

v2.2.0

3 July 2020

• add --prepend option as altenative to prepend-token [#172](https://github.com/CookPete/auto-changelog/issues/172)
• Fix bug when no existing tags [#170](https://github.com/CookPete/auto-changelog/issues/170)

v2.1.0

14 June 2020

• Add --hide-credit option [#166](https://github.com/CookPete/auto-changelog/issues/166)
• Add --unreleased-only option [#165](https://github.com/CookPete/auto-changelog/issues/165)
• Fix --starting-version [#164](https://github.com/CookPete/auto-changelog/issues/164)
• Add ability to prepend to an existing changelog [#156](https://github.com/CookPete/auto-changelog/issues/156)
• Use tag date rather than first commit date [#162](https://github.com/CookPete/auto-changelog/issues/162)
• Add CONTRIBUTING.md [#141](https://github.com/CookPete/auto-changelog/issues/141)
• Add merge and fix support to commit-list helper [#146](https://github.com/CookPete/auto-changelog/issues/146)

v2.0.0

10 April 2020

• Refactor codebase [#144](https://github.com/CookPete/auto-changelog/issues/144)
• Breaking change: Remove the need for core-js and building with babel 2383380
• Breaking change: Refactor git data fetching logic 09325ac
• Improve progress output a2ba4ac

Commits

• 135d2af 2.2.1
• 0957b43 Remove requirement for --latest-version to be valid semver
• 1fc916c Mild refactor
• 4ac8830 2.2.0
• 4da5a9c Fix bug when no existing tags
• cc1ef37 add --prepend option as altenative to prepend-token (#172)
• 0687370 2.1.0
• 7e6ec74 Add --hide-credit option
• 0bbab49 Add --unreleased-only option
• b35b4ec Fix --starting-version
• Additional commits viewable in compare view

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