Tests: Removed BrowserStack integration in this repository (see ckedi…

…tor/ckeditor5#1742).

.travis.yml

@@ -28,6 +28,4 @@ after_script:
 - ckeditor5-dev-tests-notify-travis-status
 env:
   global:
-  - secure: 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
-  - secure: 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
-  - secure: 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
+  - secure: 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

README.md

@@ -4,7 +4,6 @@ CKEditor 5 undo feature
 [![Join the chat at https://gitter.im/ckeditor/ckeditor5](https://badges.gitter.im/ckeditor/ckeditor5.svg)](https://gitter.im/ckeditor/ckeditor5?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![npm version](https://badge.fury.io/js/%40ckeditor%2Fckeditor5-undo.svg)](https://www.npmjs.com/package/@ckeditor/ckeditor5-undo)
 [![Build Status](https://travis-ci.org/ckeditor/ckeditor5-undo.svg?branch=master)](https://travis-ci.org/ckeditor/ckeditor5-undo)
-[![BrowserStack Status](https://automate.browserstack.com/automate/badge.svg?badge_key=d3hvenZqQVZERFQ5d09FWXdyT0ozVXhLaVltRFRjTTUyZGpvQWNmWVhUUT0tLUZqNlJ1YWRUd0RvdEVOaEptM1B2Q0E9PQ==--c9d3dee40b9b4471ff3fb516d9ecf8d09292c7e0)](https://automate.browserstack.com/public-build/d3hvenZqQVZERFQ5d09FWXdyT0ozVXhLaVltRFRjTTUyZGpvQWNmWVhUUT0tLUZqNlJ1YWRUd0RvdEVOaEptM1B2Q0E9PQ==--c9d3dee40b9b4471ff3fb516d9ecf8d09292c7e0)
 [![Coverage Status](https://coveralls.io/repos/github/ckeditor/ckeditor5-undo/badge.svg?branch=master)](https://coveralls.io/github/ckeditor/ckeditor5-undo?branch=master)
 <br>
 [![Dependency Status](https://david-dm.org/ckeditor/ckeditor5-undo/status.svg)](https://david-dm.org/ckeditor/ckeditor5-undo)