Add a changelog entry

Author: mpdude

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog for FriendsOfBehat/MinkExtension
+
+## Version 2.8.0
+
+* Goutte support has been deprecated, and will be removed in the next major release. The `GoutteFactory` will trigger a deprecation
+  notice when it is used to build a driver, for example by using `goutte` as the driver identifier in your `behat.yml` configuration
+  file (https://github.com/FriendsOfBehat/MinkExtension/pull/39/). Note, however, that Behat currenty does not have a built-in mechanism
+  to collect such deprecation notices and display them in a user-friendly way.