pm 0.15.7

A closed project or sprint can be reopened, keeping its history in one record.

Upgrade guide

1. On each machine, install the release: curl -fsSL https://github.com/Yeeef/pm/releases/download/pm-v0.15.7/install.sh | sh.
2. In the repo, run pm upgrade --to 0.15.7, then commit what it changes and merge it, as an ordinary PR.

Added

• pm project reopen <name> and pm sprint reopen <id> set a closed project or sprint open again. Each takes the reason as its body, on two lines or more, and records it, with the close reason it had, as a decision in the reopened record (--confirmed marks it source=owner). The record's Outcome, or the sprint's delivery report, goes back to "Not closed yet.", so the next close needs a fresh one; the old text stays in git history. A sprint of a closed project is refused until pm project reopen reopens the project.