Lets you check whether you are running in a continuous integration server and fetches the name of the CI service. Supported CI: Travis CI, CircleCI, Jenkins CI, Hudson, Bamboo by Atlassian, TeamCity by JetBrains, Team Foundation Server by Microsoft, GitLab CI, Codeship, Drone, Magnum CI, Semaphore, AppVeyor, Buildkite, TaskCluster, GoCD, Bitbucket Pipelines