Update CHANGELOG

Author: n-rodriguez

CHANGELOG.md

@@ -5,6 +5,7 @@
 * Drop support of Rails 4.x
 * Drop support of Ruby 2.3
 * Use [zeitwerk](https://github.com/fxn/zeitwerk) to load gem files
+* Add binstubs to ease development
 
 This is the last version to support Rails 5.0.x and Ruby 2.4.x.