better untagged versions for pbr

Registered by Robert Collins

pbr currently generates pre-release versions that are not valid per PEP440 - they are not marked as being pre-release versions. We should fix this.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Robert Collins
Direction:
Needs approval
Assignee:
Robert Collins
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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