update todo.txt

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diff --git a/todo.txt b/todo.txt
index f729e99..ab9b618 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,7 +1,6 @@
 Things to finish before moving onto compiler optimizations, C extensions, other nice features
 
 - self host. not yet compiling:
-    - io.c (TODO varargs)
     - c/eval.c, ir/fold.c (NYI flt -> u64 cvt)
     - embedfilesdir.c (static eval bug)