Add Appcircle CI/CD tool for Flutter

Add Appcircle CI/CD tool for Flutter

Author: Robert Felker

source.md

@@ -309,7 +309,7 @@ If you appreciate the content 📖, support projects visibility, give 👍| ⭐|
 
 - [Bitrise for Flutter](https://devcenter.bitrise.io/getting-started/getting-started-with-flutter-apps/) - Flutter build, test and deployment automation, free for Open Source and smaller projects.
 - [Code Magic](https://codemagic.io/) - Automate the entire flow, build and distribution by [NeverCode](https://nevercode.io/).
-- [Travis CI for Flutter](https://github.com/yjbanov/flutter_travis_sample) <!--stargazers:yjbanov/flutter_travis_sample--> - Continuous integration by [Yegor Jbanov](https://twitter.com/yegorjbanov)
+- [Appcircle for Flutter](https://appcircle.io/blog/guide-to-automated-mobile-ci-cd-for-flutter-projects-with-appcircle/) - Automated mobile CI/CD/CT with online device emulators by [Appcircle](https://appcircle.io/).
 
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