3.0.0

CHANGES:

• Support Yaml 1.2, and stop advertising Yaml 1.0 support.
  This also updates the vendored libyaml to 0.2.5 (@favonia #37).

• Add a Yaml.Util module with a number of useful combinators
  to manipulate Yaml.value types, such as retrieving keys and
  values, finding entries and converting to OCaml native
  types (@patricoferris #43)

• Move the sexpression derivers into a separate Yaml_sexp
  package (the yaml-sexp opam package). This reduces dependencies
  on the main library. You can still use Yaml types in
  ppx_sexplib_conv derivers by simply replacing the
  Yaml.value (or other type) with Yaml_sexp.value which is
  an alias that also includes the Sexp conversion functions in
  its scope. (@alan-j-hu @avsm #46).

• When outputting values, wrap special values like "true" or
  "1.0" in double quotes, so that Yaml.of_string will not
  interpret them as a non-string value (@avsm #47).

• Track anchors and mappings in Yaml.yaml (but not in the
  Yaml.value JSON representation). This also allows non-scalar
  values to be used as keys. (@favonia #38)

• Bump the internal write buffer for stream emission to
  256k from 64k, as people are writing ever-larger Yaml
  files! In the future, this static buffer will be replaced
  by a dynamically growing output buffer but for now needs
  to be set manually.

• The minimum supported OCaml version is now OCaml 4.05.