Remove TODO comment as it is now done

src/read.c

diff --git a/src/read.c b/src/read.c
index a04f56a..2e6e921 100644
--- a/src/read.c
+++ b/src/read.c
@@ -88,8 +88,6 @@
 
 typedef struct avifData
 {
-    // TODO: Everything in here using a MAX_* constant is a bit lazy; it should all be dynamic
-
     avifFileType ftyp;
     avifItemArray items;
     avifPropertyArray properties;