update CHANGELOG

Author: jamis

CHANGELOG.md

@@ -1,3 +1,21 @@
+1.5.0
+-----
+
+- "Ignore" support for SQLite [@jfiander]
+- "Ignore" support for PostgreSQL [Mauro Berlanda]
+- add a callback for before_save [René Sprotte]
+
+1.4.0
+-----
+
+- better support for Rails 5
+- add an option for ignoring errors on insert
+
+1.3.0
+-----
+
+- Adds support for an "after save" callback on the worker.
+
 1.2.0
 -----