Update models to the latest versions
Update signature version test suite to handle double urlencoding
Bumping version to 0.56.0
Merge branch 'release-0.56.0' into develop

* release-0.56.0:
  Bumping version to 0.56.0
  Update signature version test suite to handle double urlencoding
  Update models to the latest versions
Merge branch 'develop' of https://github.com/boto/botocore into develop