Setting $VERSION to an unquoted v-string results in an indexing fail for new package names

[neilb]

If you're doing the first release of a package, and you set the version string to an unquoted v-string, such as

our $VERSION = v1.0.1;

Then the uploader will get a message saying they don't have an indexing permission on the package.

Putting double quotes around the v-string will fix it, so we should at least recognise the problem and tell the uploader.

[rjbs]

Weird.

[rjbs]

I started #410

I think we can fix this once we do some other work.