min_version is treated as a float, thus can't have two dots like 0.18.1

[anthonyfok]

Perhaps a bug, and perhaps not a bug:

After building a local copy of themes.gohugo.io using spf13/hugoThemeSiteScript,
running hugo server -s hugoThemeSite/themeSite fails to start the server due to the
following fatal error:

ERROR: page.go:1309: Error parsing page meta data for startbootstrap-clean-blog.md
ERROR: page.go:1310: (15, 15): cannot have two dots in one float
ERROR: page.go:683: (15, 15): cannot have two dots in one float

It turns out that the author of the said theme has set the min_version in his theme.toml to 0.18.1, but min_version is currently treated as a float number in hugo, and thus can't have two or more "decimal points".

I have sent a pull request to change 0.18.1 to 0.18 at humboldtux/startbootstrap-clean-blog#26

Though I wonder if we should change min_version to read a string (so 0.18.1 would work) in some future version, or if we should just document the current behaviour?

[moorereason]

We should start using https://github.com/Masterminds/semver.

[github-actions]

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