Zero Major Caret Special Case

[Tarrence van As]

The semver specification has a special case for the caret constraint when the major version is zero. In that case it is equivalent to tilde. It is described a bit more here: https://nodesource.com/blog/semver-tilde-and-caret/

Would you be ok with me adding this logic?

Edit: Hm i see this is described here but i'm seeing a different behavior

semver/doc.go

Line 152 in 49c09bf

     * `^0.2` is equivalent to `>=0.2.0 <0.3.0` 

[Tarrence van As]

Ah I was pulling an old version of the lib. Works great in v3!