Log Message:
Update to 1.18

Upstream changes:
version 1.18: Fri 21 Oct 09:50:51 CEST 2016

	Fixes:
	- die_decode() should not return an 'ALERT' reason, because that is
	  not deadly.  Dies are always deadly.

	Improvements:
	- ::Try has new attribute on_die, to specify whether a die in the
	  code should produce PANICs or ERRORs.  Request by [Andrew Beverley]
	- ::Die::die_decode() got on_die parameter.
	- the Dancer2 logger will always PANIC on dies.