added AppCenter to readme file

README.md

@@ -21,7 +21,7 @@ You can use Danger to codify your teams norms, leaving humans to think about har
 
 Danger JS works with GitHub or BitBucket Server for code review, then with: Travis CI, Circle CI, GitHub Actions,
 Semaphore, Jenkins, Docker Cloud, Bitrise, surf-build, Codeship, Drone, Buildkite, Nevercode, buddybuild, TeamCity,
-Visual Studio Team Services, Screwdriver, Concourse, Netlify, CodeBuild or Codefresh.
+Visual Studio Team Services, Screwdriver, Concourse, Netlify, CodeBuild, Codefresh or AppCenter.
 
 [![npm](https://img.shields.io/npm/v/danger.svg)](https://www.npmjs.com/package/danger)
 [![Build Status](https://travis-ci.org/danger/danger-js.svg?branch=master)](https://travis-ci.org/danger/danger-js)