Add CHANGELOG.md (symfony#170)

* Add CHANGELOG.md

* Fix typo

CHANGELOG.md

@@ -0,0 +1,24 @@
+CHANGELOG
+=========
+
+0.3.0
+-----
+
+* Add a new API to manipulate the mouse
+* Keep the browser window open on fail, when running in non-headless mode
+* Automatically open Chrome DevTools when running in non-headless mode
+* PHPUnit 8 compatibility
+* Add a PHPUnit extension to keep alive the webserver and the client between tests 
+* Change the default port of the web server to `9080` to prevent a conflit with Xdebug
+* Allow to use an external web server instead of the built-in one for testing
+* Allow to use a custom router script
+* Allow to use a custom Chrome binary
+
+0.2.0
+-----
+
+* Add JS execution capabilities to `Client`
+* Allow keeping the webserver and client active even after test teardown
+* Add a method to refresh the crawler (`Client::refreshCrawler()`)
+* Add options to configure the web server and ChromeDriver
+* PHP 7.1 compatibility