Update to the latest ppx_sexp_conv

[Chris00]

Please update to the latest version of ppx_sexp_conv. Indeed, trying to install tls otherwise requires a lot of downgrades...

[copy]

I checked, and tls is already compilable with ppx_sexp_conv>=v0.11.1 (it doesn't have the bug that nocrypto suffers from). ppx_sexp_conv>=v0.11.1 also doesn't have a dependency on Base.

[hannesm]

yes, we should make a v0.11.1 compatible release of tls and x509, but a precondition is nocrypto being able to cope with v0.11.1 (there's a PR mirleft/ocaml-nocrypto#146). once that is merged and released, I'll adapt both tls and x509 to deal with ppx_sexp_conv v.0.11.1+. both need modifications to the META files (similar to nocrypto) to reflect the runtime dependencies.

[hannesm]

#381 adds these runtime dependencies (soon to be merged and released)

[hannesm]

#381 is merged now, expect a release soon