Added compatibility for lua events API change 6.2.1.

contrib/image_time.lua

@@ -114,6 +114,7 @@ img_time.module_installed = false
 img_time.event_registered = false
 
 du.check_min_api_version("3.0.0", "image_time") 
+local CURR_API_STRING = dt.configuration.api_version_string
 
 
 -- Tell gettext where to find the .mo file translating messages for a particular domain
@@ -551,7 +552,7 @@ if dt.gui.current_view().id == "lighttable" then
 else
   if not img_time.event_registered then
     dt.register_event(
-      "view-changed",
+      CURR_API_STRING >= "6.2.1" and "image_time", "view-changed" or "view-changed" ,
       function(event, old_view, new_view)
         if new_view.name == "lighttable" and old_view.name == "darkroom" then
           install_module()