A quick stab at a machine-readable CHANGELOG format

CHANGELOG.json

{
  "project": "some-project",
  "url": "https://github.com/someorg/some-project",
  "description": "Some project or other for SomeOrg",

  "releases": [
    {
      "version": "1.0.0",
      "date": "2014-12-05",
      "items": [
        {
          "title": "Initial release"
        }
      ],
      "links": [
        {
          "type": "tree",
          "url": "https://github.com/someorg/some-project/tree/v1.0.0"
        }
      ]
    },

    {
      "version": "1.0.1",
      "date": "2014-12-15",
      "items": [
        {
          "title": "Ensure error message displays in page flow",
          "links": [
            {
              "type": "issue",
              "title": "CC-3",
              "url": "https://someorg.atlassian.net/browse/CC-3"
            }
          ]
        }
      ],
      "links": [
        {
          "type": "tree",
          "url": "https://github.com/someorg/some-project/tree/1.0.1"
        },
        {
          "type": "diff",
          "url": "https://github.com/someorg/some-project/compare/v1.0.0...1.0.1"
        }
      ]
    },

    {
      "version": "1.0.2",
      "date": "2014-12-17",
      "items": [
        {
          "title": "Support payments through new SomeOrg account",
          "links": [
            {
              "type": "issue",
              "title": "CC-6",
              "url": "https://someorg.atlassian.net/browse/CC-6"
            }
          ]
        },
        {
          "title": "Rebuild unit tests to better cover current server behaviour",
          "links": [
            {
              "type": "issue",
              "title": "CC-8",
              "url": "https://someorg.atlassian.net/browse/CC-8"
            }
          ]
        },
        {
          "title": "Expand the list of responses from the NullGatewayAdapter",
          "links": [
            {
              "type": "issue",
              "title": "CC-9",
              "url": "https://someorg.atlassian.net/browse/CC-9"
            }
          ]
        }
      ],
      "links": [
        {
          "type": "tree",
          "url": "https://github.com/someorg/some-project/tree/1.0.2"
        },
        {
          "type": "diff",
          "url": "https://github.com/someorg/some-project/compare/v1.0.1...1.0.2"
        }
      ]
    },

    {
      "pending": true,
      "items": [
        {
          "title": "...",
          "links": [
            {
              "type": "issue",
              "title": "CC-X",
              "url": "https://someorg.atlassian.net/browse/CC-X"
            }
          ]
        }
      ]
    }
  ]
}