Remove obsolete TODO item

We don't cache any metrics internally, so the correct way to add more
glyph metrics items is to add new callbacks for them.  We already have
separeate callbacks for advance vs extents.

diff --git a/TODO b/TODO
index 0345d4c..08376e3 100644 (file)
--- a/TODO
+++ b/TODO
@@ -23,8 +23,6 @@ API issues to fix before 1.0:
 
 - Use tags for hb_script_t?
 
-- Future-proof metrics struct
-
 - Figure out how many .so objects, how to link, etc