add release notes for #51

Author: drnic

ci/release_notes.md

@@ -1 +1,16 @@
-* PR to add functionality for the user to use link_names in slack notification. This gives the user possibility to ping user groups etc which otherwise is impossible. [#48]
+https://github.com/cloudfoundry-community/slack-notification-resource/pull/51
+
+Added functionality to be able to set link_names as parameter in pipeline with it defaulting to false. Also modified the tests so they actually pass with the new added parameter. Has been tested in a pipeline with successfully notified user group by writing @ which then mentioned the group. Was tested by using
+
+```
+resource_types:
+- name: slack-notification
+  type: docker-image
+  source:
+    repository: quay.io/pontusarfwedson/slack-notification-resource
+    tag: feature-link-names
+```
+
+in our pipeline (which points to a docker image build from this exact branch).
+
+