Bumps [composer/installers](https://github.com/composer/installers) from 1.5.0 to 1.6.0.
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<summary>Changelog</summary>
*Sourced from [composer/installers's changelog](https://github.com/composer/installers/blob/master/CHANGELOG.md).*
> # Change Log
>
> ## [Unreleased]
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<summary>Commits</summary>
- [`cfcca6b`](cfcca6b1b6) Merge pull request [#397](https://github-redirect.dependabot.com/composer/installers/issues/397) from harmenjanssen/normalize-october-plugin
- [`8da283a`](8da283adf7) Normalise vendor directory containing hyphen
- [`5d15e4e`](5d15e4e9aa) Merge pull request [#376](https://github-redirect.dependabot.com/composer/installers/issues/376) from thomscode/disable-installers
- [`78eb8ca`](78eb8ca263) Add use statements in place of fully qualified namespaces
- [`4bff163`](4bff1637ea) Merge branch 'master' into disable-installers
- [`a118c5b`](a118c5bbb5) Merge pull request [#391](https://github-redirect.dependabot.com/composer/installers/issues/391) from davidbarratt/mediawiki-core
- [`2353998`](2353998d5a) Add MediaWiki Core
- [`c3c5297`](c3c5297a3b) Add false as an option to prevent installers from being disabled.
- [`3806135`](38061358f2) Update documentation to include false option
- [`1aa22c1`](1aa22c1756) Merge branch 'master' into disable-installers
- Additional commits viewable in [compare view](https://github.com/composer/installers/compare/v1.5.0...v1.6.0)
</details>
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[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=composer/installers&package-manager=composer&previous-version=1.5.0&new-version=1.6.0)](https://dependabot.com/compatibility-score.html?dependency-name=composer/installers&package-manager=composer&previous-version=1.5.0&new-version=1.6.0)
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