Add TODO item

f8be443a · Behdad Esfahbod · 7951279b · f8be443a
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TODO TODO +1 -0

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--- a/TODO
+++ b/TODO
@@ -2,6 +2,7 @@
 - Use size_t in sanitize?
 - Buffer error handling?
 - Better define HB_INTERNAL
+- Future-proof metrics struct

 hb-ot:
 - Fix ot query APIs