Update CHANGELOG

Author: n-rodriguez

CHANGELOG.md

@@ -4,7 +4,12 @@
 
 * Drop support of Rails 5.0.x and 5.1.x
 * Drop support of Ruby 2.4
+* Add support of Rails 6.1
+* Add support of Ruby 3.0
+* Switch from Travis to Github Actions
+* Improve specs
 * `AjaxDatatablesRails.config.db_adapter=` is removed and is configured per datatable class now. It defaults to Rails DB adapter. (fixes [#364](https://github.com/jbox-web/ajax-datatables-rails/issues/364))
+* Fix lib loading with JRuby (fixes [#371](https://github.com/jbox-web/ajax-datatables-rails/issues/371))
 
 ## 1.2.0 (2020-04-19)