Update deprecation guide

Author: kategengler

content/ember-cli/v5/travis-ci-support.md

@@ -1,7 +1,11 @@
 ---
 title: Travis CI Support
-since: 5.4.0
+since: 5.5.0
 until: 6.0.0
 ---
 
-Travis CI is no longer recommended.
+Travis CI is no longer recommended. Since Travis CI announced the end of its unlimited support for open-source projects, most of the Ember community has switched over to using GitHub Actions or other alternatives instead. 
+
+The Ember CLI option for Travis CI when generating projects has been deprecated, including the `--ci-provider=travis ` command-line flag.
+
+Travis CI may continue to be used, but the config will no longer be maintained or updated by the Ember CLI blueprint.