Update to version 1.5.0
    
    Adds support for "intents" in Modulemd.Defaults
    Adds `Modulemd.get_version()`
    Adds support for RPM whitelists in the buildopts
    Adds a new object: Modulemd.Buildopts
    Deprecates Modulemd.Module.get_rpm_buildopts()
    Deprecates Modulemd.Module.set_rpm_buildopts()
    Fixes some missing license blurbs
    
    Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>