Bot should remind PR authors to add a description

[blomquisg]

When a PR is submitted without a description, the bot should remind people to add a description that describes why the PR is important to the ManageIQ codebase.

Possibly even include some rules around not just describing the changes, but describing the purpose of the changes.

[miq-bot]

This issue has been automatically marked as stale because it has not been updated for at least 3 months.

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