Add step to add release data to Committee Report Helper (#68)

dev/README_RELEASE_CLIENT.md

diff --git a/dev/README_RELEASE_CLIENT.md b/dev/README_RELEASE_CLIENT.md
index 07fd129..ab67a14 100644
--- a/dev/README_RELEASE_CLIENT.md
+++ b/dev/README_RELEASE_CLIENT.md
@@ -404,3 +404,7 @@
 ## Notify developers of release
 
 See Airflow process documented [here](https://github.com/apache/airflow/blob/master/dev/README_RELEASE_AIRFLOW.md#notify-developers-of-release) (just replace Airflow with Airflow Client)
+
+## Add release data to Apache Committee Report Helper
+
+Add the release data (version and date) at: https://reporter.apache.org/addrelease.html?airflow
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