• Added clink.onhistory() to register a function to be called when the input line has been accepted and is about to be added to history (and optionally cancel adding it).
• Fixed history delete with a negative number so it indexes backwards from the end, as advertised.
• Fixed calling clink.refilterprompt() from a coroutine, and related fixes to ensure various Lua functions coexist properly with coroutines.
• Fixed #520; add a link to the Releases page in the updater dialog box.