Add minimum OCaml version to opam file
Irmin 1.3 no longer works on 4.05 for some reason:
File "src/irmin/type.ml", line 1123, characters 21-24:
Error: The type constructor t expects 2 argument(s),
but is here applied to 1 argument(s)
ef8c97
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May 10 22:06 +00:00