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Update packages/preface/preface.1.1.0/opam

Co-authored-by: Marcello Seri <mseri@users.noreply.github.com>

Changed files
+1 -1
packages
preface
preface.1.1.0
+1 -1
packages/preface/preface.1.1.0/opam
···
build: [
[ "dune" "subst" ] {dev}
[ "dune" "build" "-p" name "-j" jobs ]
-
[ "dune" "runtest" "-p" name ] {with-test}
+
[ "dune" "runtest" "-p" name ] {with-test & ocaml:version >= "5.1.0"}
[ "dune" "build" "@doc" "-p" name ] {with-doc}
]