2.2
  - Update jsonld.js to 1.8.1 (final version to support traditional javascript)
  - Support "alternate location" links: https://www.w3.org/TR/json-ld11/#alternate-document-location

2.1
  - Refactor async code to work with upcoming version of V8

2.0
  - Update of bunlded jsonld.js library to v1.0.1 (major update)
  - Update the document loader to work with the new v1.0.1
  - Improve error message for failed downloads
  - Switch to curl::parse_header_list(), may fix 'link' parsing
  - Option 'jsonld_use_accept' (default TRUE) to disable content negotiation

1.2
  - Support filename parameters (in addition to URLs and literal json)
  - Add URLs to DESCRIPTION
  - Update maintainer contact details

1.1
  - Add support for URL parameters
  - Add unit test suite from http://json-ld.org/test-suite/
  - Lots of small fixes

1.0
  - Initial CRAN release
