In the return value, `name` has been changed to `package`,
and `vConstraint` is now `versionConstraint`.
`constraint.package` is better than `constraint.name`, where
`constraint` is a PackageConstraint. It's also more consistent
with functions like parsePackageAtVersion which return an object
like `{package, version}`.
`vConstraint` was too cryptic.
Changes were discussed with Glasser in a code review.
Troposphere does not call parseConstraint or work with constraint
objects, so it doesn't need to change.
This is a breaking change to the package-version-parser API (or one
method of it, at least), but it is considered an internal API so we
are not worrying too much about it.
45752e3203