CI: test only on OCaml 4.13 and higher #335
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Dream no longer installs on lower OCaml versions, because mirage-crypto requires OCaml 4.13. See
mirage/mirage-crypto#233
The reason for mirage-crypto requiring 4.13 seems to be minor convenience, and isn't justified in my opinion. However, Dream itself will likely require OCaml 5 in the medium term due to upgrading to multicore and effects, so it seems unnecessary to make an effort to restore 4.08 support at this point.