prel release, from the VERSION file to the GitHub release has been fixed.

See more details at : https://github.com/pdulvp/prel/issues/2

• prel release 1.0.1 writes the VERSION file, commits it alone, tags v1.0.1, pushes both and publishes the GitHub release, its notes the commits since the last tag
• every precondition is checked before anything is written, the tag on the remote included: a release half made is worse than one not started
• uncommitted changes are listed and confirmed rather than carried in, and no terminal to ask on is an answer of no
• the release commit carries PREL_SKIP_ISSUE, so it never spends the issue a pending sum-up is holding for the next real commit
• prel.tagPrefix and prel.versionFile for projects that name the tag or the file differently

_{Filed by prel from the completed plans at commit time.}