CHANGES:

in #414 by @hannesm

• Drop support for RC4 ciphersuite
• Raise lower TLS version in default configuration to 1.2
• tls_lwt no longer calls Mirage_crypto_rng_unix.initialize -- this needs to be done in the application, inside Lwt_main.run: Mirage_crypto_rng_lwt.initialize () >>= fun () ->
• Support ECDHE ciphersuites in TLS 1.2 and below as specified in RFC 8422 (requested in #413 by @ryanakca, also in #362 by @orbitz @annubiz)
• drop "TLS_" prefix from ciphersuite constructors
• BUGFIX: TLS client (<= 1.2) assembling an empty Certificate message (noticed in #413, present since 0.12.0 release)
• Cleanup Packet.any_ciphersuite list (remove ARIA, CAMELLIA, KRB5, EXPORT)
• Adapt interoperability test scripts with TLS 1.3 support