This update for plasma5-workspace fixes security issues and bugs.

The following vulnerabilities were fixed:

- CVE-2018-6790: Desktop notifications could have been used to load arbitrary remote images into Plasma,
allowing for client IP discovery (boo#1079429)
- CVE-2018-6791: A specially crafted file system label may have allowed execution of arbitrary code (boo#1079751)

The following bugs were fixed:

- Plasma could freeze with certain notifications (boo#1013550)