Release 2.0.31 (#4245)

* replace strings by class references
* allow 64 chars for username
* fix time can be optional and null
* fix timezone is not respected
* bump version
* fix br in attribute
* support different visible duration from booked duration
* fix image URL

src/Constants.php

@@ -17,11 +17,11 @@ class Constants
     /**
      * The current release version
      */
-    public const VERSION = '2.0.30';
+    public const VERSION = '2.0.31';
     /**
      * The current release: major * 10000 + minor * 100 + patch
      */
-    public const VERSION_ID = 20030;
+    public const VERSION_ID = 20031;
     /**
      * The software name
      */