Update README.md

README.md

@@ -29,6 +29,7 @@ This is **crowi-plus** that is the fork of [Crowi][crowi], is [perfectly compati
   * [Multiple sites example](https://github.com/weseek/crowi-plus-docker-compose/tree/master/examples/multi-app)
   * [HTTPS(with Let's Encrypt) proxy integration example](https://github.com/weseek/crowi-plus-docker-compose/tree/master/examples/https-portal)
 * [Added miscellaneous features](https://github.com/weseek/crowi-plus/wiki/Additional-Features)
+* Support for IE11 (Experimental)
 * Developer-friendly
   * Less compile time
   * LiveReload separately available by server/client code change