Ci-info

Breaking changes:

* Drop support for Node.js end-of-life versions: 0.10, 0.12, 4, 5, 7,
and 9
* Team Foundation Server will now be detected as Azure Pipelines. The
constant `ci.TFS` no longer exists - use `ci.AZURE_PIPELINES` instead
* Remove deprecated `ci.TDDIUM` constant - use `ci.SOLANDO` instead

New features:

* feat: support Azure Pipelines ([23](https://github.com/watson/ci-info/pull/23))
* feat: support Netlify CI ([26](https://github.com/watson/ci-info/pull/26))
* feat: support Bitbucket pipelines PR detection ([27](https://github.com/watson/ci-info/pull/27))

* feat: add Sail CI support
* feat: add Buddy support
* feat: add Bitrise support
* feat: detect Jenkins PRs
* feat: detect Drone PRs

* fix: use full path to vendors.json

* feat: add dsari detection ([15](https://github.com/watson/ci-info/pull/15))
* feat: add ci.isPR ([16](https://github.com/watson/ci-info/pull/16))

* feat: add Cirrus CI detection ([13](https://github.com/watson/ci-info/pull/13))
* feat: add Shippable CI detection ([14](https://github.com/watson/ci-info/pull/14))

* chore: reduce npm package size by not including `.github` folder content ([11](https://github.com/watson/ci-info/pull/11))