Changes in version 0.2.1                        

  - add IMDSv2 support (#10)

                 Changes in version 0.2.0 (2019-07-15)                  

  - revise timeout for curl checks against instance metadata (Thanks
    @jmorten)
  - curl timeout now respects the AWS_METADATA_SERVICE_TIMEOUT
    environment variable (like boto3)

                 Changes in version 0.1.6 (2019-04-24)                  

  - Added new functions: is_ecs() to check whether R is running in an
    Elastic Container Store (ECS) instance, and ecs_metadata() to
    retrieve credentials from the container. (#2, h/t @jon-mago)

                 Changes in version 0.1.5 (2018-07-26)                  

  - Now supports querying ECS task role

                 Changes in version 0.1.4 (2018-04-03)                  

  - Previous .onLoad() functionality added in 0.1.3 is now moved to
    .onAttach() to comply with CRAN policy.

                        Changes in version 0.1.3                        

  - Added a function instance_document() that returns a list of the
    "instance identity document" information. This is useful for
    identifying the region an instance is running in.
  - When the package is loaded on an EC2 instance (as identified by
    is_ec2() during package load), the package attempts to set the
    AWS_DEFAULT_REGION environment variable if it has not already been
    specified. This helps handle request signing.

                 Changes in version 0.1.2 (2017-06-30)                  

  - Added a function is_ec2() that returns a logical based on whether
    metadata is retrievable.

                 Changes in version 0.1.1 (2016-12-20)                  

  - Initial release.