Typographical Pedantry

[colin-haber]

Referring to rule 10:

A pre-release version MAY be denoted by appending a dash and a series of dot separated identifiers immediately following the patch version.

I'd like to point out that you probably mean a hyphen. I know it seems picky, but when making a standard, precision is important.
Dashes are – (–) and — (—). Hyphens are -, which is actually on the keyboard.