Configure prerelease settings in github.
Configure prerelease settings in github.

If the new version number is a prerelease version, set the appropriate
flag on the github release.

The prerelease status is driven here by two factors.

1. If the isStable() method returns false, it's a prerelease.  This flag
    is set based off of whether there are alpha/beta/etc flags in the
    version.
2. If the major version number is 0, it's a prerelease.  The 0.*
    versions can break compatibility and such at any time.

nubs/release-notes,guillermoandrae/release-notes,guywithnose/release-notes