feat: Make server version available to front-ends #429
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This "future-proof PR" is needed to help interoperability in a loosely-coupled way,
so the latest learn-ocaml-client binary (& the learn-ocaml.el front-end depending on it) is compat. with learn-ocaml ↓ version "0.12".
There are now three possible commands:
learn-ocaml-client --version
learn-ocaml-client server-version
learn-ocaml-client server-version --min
(the min of the previous two)Note: the back-end API is unchanged by this PR.