VersionInfo should support string output

[nerdoc]

It may seem weird, but the VersionInfo object lacks the "opposite" thing of parsing a SemVer. I just like to have a str output like "3.0.0" from a VersionInfo - this is not implemented.
Wouldn't it be nice to have something like

def to_str(self):
    return self.format_version(
        self.major, 
        self.minor,
        self.patch,
        self.prerelease,
        self.build
    )

So if you have a VersionInfo object you can print out the original/created string again (for saving in a DB e.g.):

>>> version = VersionInfo(3, 4, 5)
>>> print(version.to_str())
3.4.5

[kxepal]

str(VersionInfo(3, 4, 5)) should works as expected. Or it doesn't?

[nerdoc]

OMG, yes. Sorry for the spam.

[kxepal]

No worries (:

[nerdoc]

BTW - VersionInfo(3,4,5) is not possible in 2.8.0 (my installed version using pip):

TypeError: __new__() missing 2 required positional arguments: 'prerelease' and 'build'

VersionInfo(3,4,5,0,0) is needed
You changed a few things in 2.8.1 ;-)

[kxepal]

Indeed, that was fixed in 7fdf7b2

@scls19fr how about new release?

[scls19fr]

Related issue #98

2.8.1 version is now available