This release just contains the following bug-fixes:
- Fixed bug with (only) free bookings (see https://wp-event-organiser.com/forums/topic/error-some-fields-are-not-valid/).
- Fixed translation (textdomain) issues with event search shortcode.
- Fixed minor bug with settings page javascript.
- Ensure site url has trailingslash when using it for an IPN url.
- Fixed bug with German translation introduced in 1.5.
- Fixes bug with duplicated tickets (see https://wp-event-organiser.com/forums/topic/tickets-being-duplicated/).