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This change adds support for an optional hyphen before a prerelease name.
This is far from ideal, but since the v1.0.0 spec has (at different times) declared both that prereleases must begin with an letter and that they must begin with a hyphen, it seems prudent to do some form of transitional change. Then again, backwards compatibility may not be a concern for this early version, so we may wish to skip the transition altogether.
In any event, this change implements the 80% case between both versions of the spec: most prerelease versions already begin with a letter, whether they contain the hyphen or not.