v0.4.0

CHANGES:

Breaking changes:

• Wrap errors with the `Capnp tag to make it easier to compose with other types of error (#172, #173).

• Prefix all command-line options with capnp- (#163).
  e.g. --listen-address is now --capnp-listen-address.
  The old names were confusing for applications that supported other protocols too (e.g. a web server).

New features:

• Add Capability.with_ref convenience function (#170).
  This automatically calls dec_ref when done.

• Add Unix Cap_file module to load and save Sturdy_refs (#165).
  In particular, this ensures that saved cap files get a mode of 0o600, since they contain secrets.

• Export cmdliner network address parsing (#165).
  This is useful if you don't want to use the default option parsing.
  For example, if you want to make Cap'n Proto an optional feature of your program.

• Upgrade from uint (which is deprecated) to the newer stdint (#166, #168).
  The latest version of uint is just a wrapper around stdint,
  so this shouldn't break anything if you are using the latest version.

• Put cmdliner options in their own man-page section (#163).
  Use Capnp_rpc_unix.manpage_capnp_options to control where in your man-page
  they appear.

• Enable SO_KEEPALIVE for TCP connections (#167).
  For use with Docker's libnetwork, try something like this in your stack.yml:

  sysctls:
    - 'net.ipv4.tcp_keepalive_time=60'
  

Bug fixes:

• Close listening socket when shutting down a vat (#171).

• Don't mark secret keys as executable (#164).

• Update README example to use dune (#162).

Build changes:

• Replace topkg with dune-release (#169)

• Update opam email address and fix missing bound (#161).

• Update the dune files to allow duniverse / vendored builds (#165).

• Fix the crossed-calls unit test (#171).

• Force all capnp-rpc subpackages to have the same version (#173).