Merge branch 'release-0.59.0' into develop

* release-0.59.0:
  Bumping version to 0.59.0
  Add smoke test for route53domains
  Update models to the latest version
Choose proper XML label for structured payload
Add unittest for #196
Merge branch 'takumn-fix-structured-xml-label' into develop

* takumn-fix-structured-xml-label:
  Add unittest for #196
  Choose proper XML label for structured payload
Updated models to the latest version.

Updated Docs as well.
Bumping version to 0.60.0
Merge branch 'release-0.60.0'

* release-0.60.0:
  Bumping version to 0.60.0
  Updated models to the latest version.
  Add unittest for #196
  Choose proper XML label for structured payload