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Update packages/iostream/iostream.0.1/opam

Co-authored-by: Thomas Gazagnaire <thomas@gazagnaire.org>

Changed files
+1 -1
packages
iostream
iostream.0.1
+1 -1
packages/iostream/iostream.0.1/opam
···
"ounit2" {with-test}
]
build: [
-
["dune" "subst"] {pinned}
+
["dune" "subst"] {dev}
[
"dune"
"build"