Prepare release 3.4.3

CHANGELOG.md

 ## Changelog
 
-### 3.4.2
+### 3.4.3
   * Fix missing notify that caused problems when adding a new virtual server in `sites_available`
 
 ### 3.4.1

metadata.json

 {
   "name": "jgazeley-freeradius",
-  "version": "3.4.2",
+  "version": "3.4.3",
   "author": "jgazeley",
   "summary": "Install and configure FreeRADIUS",
   "license": "Apache-2.0",