Update dependency composer/installers to v1.9.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
composer/installers (source)	require	minor	1.8.0 -> 1.9.0

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Release Notes

composer/installers

v1.9.0

Compare Source

v1.9.0 - 2020-04-07

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Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻️ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan

     Update dependency composer/installers to v1.9.0

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[codeclimate]

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[renovate]

Renovate Ignore Notification

As this PR has been closed unmerged, Renovate will now ignore this update (1.9.0). You will still receive a PR once a newer version is released, so if you wish to permanently ignore this dependency, please add it to the ignoreDeps array of your renovate config.

If this PR was closed by mistake or you changed your mind, you can simply rename this PR and you will soon get a fresh replacement PR opened.

[Remzi1993]

Merge.