Update CHANGELOG [ci skip]

Author: n-rodriguez

CHANGELOG.md

@@ -1,6 +1,6 @@
 # CHANGELOG
 
-## 0.4.1 (to come)
+## 0.4.1 (2018-05-06)
 
 * Fix: Restore behavior of #filter method [Comment](https://github.com/jbox-web/ajax-datatables-rails/commit/07795fd26849ff1b3b567f4ce967f722907a45be#comments)
 * Fix: Fix erroneous offset/start behavior [PR #264](https://github.com/jbox-web/ajax-datatables-rails/pull/264)
@@ -9,6 +9,7 @@
 * Add: Add "order nulls last" option [PR #79](https://github.com/jbox-web/ajax-datatables-rails/pull/279)
 * Change: Rename `additional_datas` method as `additional_data` [PR #251](https://github.com/jbox-web/ajax-datatables-rails/pull/251)
 * Change: Added timezone support for daterange [PR #261](https://github.com/jbox-web/ajax-datatables-rails/pull/261)
+* Change: Add # frozen_string_literal: true pragma
 * Various improvements in internal API
 
 **Note :** This is the last version to support Rails 4.0.x and Rails 4.1.x