Prepare release 3.4.0

CHANGELOG.md

 ## Changelog
 
+### 3.4.0
+  * Fix bug with modules that have ensure => absent
+  * Fix bug with module::files where content and source
+  * Fix bug with path of krb5 module
+  * Manage parameter `allow_expired_crl`
+  * Clean up comments in templates to reduce the size
+
 ### 3.3.0
   * Deploy modules to `mods_available` and symlink to `mods_enabled`
   * Deploy modules to `sites_available` and symlink to `sites_enabled`

metadata.json

 {
   "name": "jgazeley-freeradius",
-  "version": "3.3.0",
+  "version": "3.4.0",
   "author": "jgazeley",
   "summary": "Install and configure FreeRADIUS",
   "license": "Apache-2.0",