Overview of changes between 1.13.3 and 1.13.4
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* Update to Unicode Character Database 5.0.0.
* Misc fixes.
* Bugs fixed in this release:
	Bug 336282 – Update to Unicode Character Database 5.0.0
	Bug 347073 – Allow empty GPOS table
	Bug 347021 – atsui crash when a matching font cannot be found.
	             Patch from Brian Tarricone.