Added support for web identity federation.
Merge branch 'wif' into develop
Fixed headers in EC2 autodocs.
Added release notes for v2.9.5.
Fixed a bug where an instance variable was not present in the low-level DynamoDB client.
Updated release notes.
Bumping version to 2.9.5
Merge branch 'release-2.9.5' into develop

* release-2.9.5:
  Bumping version to 2.9.5