Update README.md

iissnan · Aug 10, 2017 · 9c7ea1a · 9c7ea1a
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 ![Browser support](http://iissnan.com/nexus/next/browser-support.png)
 
+[![Browser Stack](.github/browserstack_logo.png)](https://www.browserstack.com/)
+>**BrowserStack** is a cloud-based cross-browser testing tool that enables developers to test their websites across various browsers on different operating systems and mobile devices, without requiring users to install virtual machines, devices or emulators.
 
 ## 贡献 Contributing