Allow to attribute changesets to merge commits

[fehnomenal]

Fix #678

[changeset-bot]

🦋 Changeset detected

Latest commit: 52de38e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 16 packages

Name	Type
@changesets/apply-release-plan	Minor
@changesets/config	Minor
@changesets/types	Minor
@changesets/git	Minor
@changesets/cli	Patch
@changesets/assemble-release-plan	Patch
@changesets/get-release-plan	Patch
@changesets/changelog-git	Patch
@changesets/changelog-github	Patch
@changesets/get-dependents-graph	Patch
get-workspaces	Patch
@changesets/parse	Patch
@changesets/pre	Patch
@changesets/read	Patch
@changesets/release-utils	Patch
@changesets/write	Patch

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