Adds 1.2.0 section

Adds 1.2.0 section with new features and fixes.

Author: ccondra

src/live-search/release-notes.md

@@ -12,6 +12,17 @@ These release notes describe the initial release of Live Search and include:
 
 ## Live Search v1.2.0
 
+-  Compatible with {{site.data.var.ee}} (EE): 2.4.x
+-  Compatible with {{site.data.var.ece}} (ECE): 2.4.x
+-  Stability: Stable
+
+-  {:.new} A "heartbeat controller" keeps the Commerce Admin session alive for extended periods of keyboard inactivity.
+-  {:.new} Live Search is automatically enabled after onboarding.
+-  {:.fix} Live Search no longer throws an error if search criteria contains an empty sort order value.
+-  {:.fix} Range filtering no longer breaks if attribute codes contain the strings "to" or "from".
+
+## Live Search v1.1.0
+
 -  Compatible with {{site.data.var.ee}} (EE): 2.4.x
 -  Compatible with {{site.data.var.ece}} (ECE): 2.4.x
 -  Stability: Stable
@@ -27,3 +38,4 @@ To learn more:
 -  [{{site.data.var.ee}} Developer Documentation]({{ site.baseurl }}/live-search/overview.html)
 -  [{{site.data.var.ee}} User Guide](https://docs.magento.com/user-guide/live-search/overview.html)
 -  [Support Knowledge Base](https://support.magento.com/hc/en-us)
+-  [Live Search on Marketplace](https://marketplace.magento.com/magento-live-search.html)