DBaas changelog v1.50 (#215)

* Added 1.50 release info.

* Additional edit

* Update _index.md

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Co-authored-by: Andreas Holmsten <[email protected]>

content/en/docs/dbaas/changelog/_index.md

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 alwaysopen: true
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+# V 1.50
+## Overview
+This release offers upward volume autoscaling, new customer database parameters, improved monitoring in terms of mail notifications and more metrics. It is now possible to create (m)TLS-based sessions where the client can prefetch server certificates. The backup management has been improved disalloving concurrent backup race conditions.
+
+## Changes
+* Auto-scale volumes, enabled by default.
+* Send email notifications to end user.
+* (m)TLS for Mysql/MariaDB, Postgres and Redis.
+* Do all DNS queries through ExternalDNS.
+* The Terraform provider has been substantially improved.
+
+## Important fixes 
+* Fixed a problem where multiple concurrent backups were executed.
+* There was a problem in removing datastores stuck in creation or modifying state.
+* Redis and MSSQL backup restore was not working properly.
+* Optimized failover time for Always on.
+
+
 # V 1.48
 ## Overview
 In this release we introduce MSSQL, the new Openstack V2 instance flavors and volume types giving even better performance and price efficiency.
@@ -58,4 +76,4 @@ This release introduces configuration management and simplified service access.
 * Improved customer error interaction for handling nodes.
 
 ## Important fixes
-* Corrected a bug that caused the control plane process to restart occasionally.
+* Corrected a bug that caused the control plane process to restart occasionally.