Display CI Status of "master" Branch Only
Display CI Status of "master" Branch Only

Travis CI, without the "branch" query param, will show the latest build regardless of the branch, which is a misleading indication of the health of the repo. At the time of this commit, "master" is 🟢 while [the latest build](https://travis-ci.org/github/JsonApiClient/json_api_client/builds/768058352) is 🔴 .

chingor13/json_api_client