Log Message:
Updated py-google-api-python-client to 1.6.1.

v1.6.1
  Version 1.6.1

  Bugfix release

  - Fixed a bug where using google-auth with scoped credentials would fail. (#328)

v1.6.0
  Version 1.6.0

  Release to drop support for Python 2.6 and add support for google-auth.

  - Support for Python 2.6 has been dropped. (#319)
  - The credentials argument to discovery.build and discovery.build_from_document
    can be either oauth2client credentials or google-auth credentials. (#319)
  - discovery.build and discovery.build_from_document now unambiguously use the
    http argument to make all requests, including the request for the discovery
    document. (#319)
  - The http and credentials arguments to discovery.build and
    discovery.build_from_document are now mutually exclusive, eliminating a
    buggy edge case. (#319)
  - If neither http or credentials is specified to discovery.build and
    discovery.build_from_document, then Application Default Credentials will
    be used. The library prefers google-auth for this if it is available, but
    can also use oauth2client's implementation. (#319)
  - Fixed resumable upload failure when receiving a 308 response. (#312)
  - Clarified the support versions of Python 3. (#316)