GetInfo returns the full version information.

UserAgent wraps the (possibly nil) transport so that it will set the user agent using the supplied product name and current version.

BuildMetadata is the Semver build metadata stored independent of the version string.

GitCommit is a Git commit identifier.

Version is a "v" prefixed Semver, including pre-release information if applicable.

Info represents available version information.

Transport sets the `User-Agent` header.