Breaking changes:

* specs-go: Renamed the repository from opencontainers/specs to opencontainers/runtime-spec, opencontainers#365

Additions:

* config: Add 'timeout' for hooks, opencontainers#346
* config-linux: Add 'maskedPaths' and 'readonlyPaths', opencontainers#364

Minor fixes and documentation:

* JSON Schema bug-fixes and improved examples, opencontainers#370
* README: Define "unconditionally compliant", opencontainers#374
* config: Make Markdown canonical, opencontainers#342
* config: Explicitly list mapping from symbolic names to UID/GIDs as out-of-scope, opencontainers#347
* config-linux: Require the runtime mount namespace for namespace 'path' values, opencontainers#275
* config-linux: Reword kernelTCP docs, opencontainers#377
* specs-go: Add omitempty to 'Device' and 'Namespace', opencontainers#340
* .travis.yml: Use built-in 'go vet' and current 'go lint', dropping Go < 1.5, opencontainers#372, opencontainers#352
* implementations: Expand ocitools scope to include testing, opencontainers#328
* style: Move one-sentence-per-line rule from the README, opencontainers#369
* style: Remove dangling parenthesis, opencontainers#359
* README: Add a link to the IRC logs, opencontainers#358
* Fix "manadate", "exmaple", "paramters", and "preferrably" typos, opencontainers#353, opencontainers#354

https://github.com/opencontainers/specs/milestones/v0.4.0

Breaking changes:

* config: Single, unified config file, opencontainers#284
* config: cwd is a required default, and must be absolute, opencontainers#286,
  opencontainers#307, opencontainers#308, opencontainers#312
* config: qualify the name of the version field, opencontainers#309
* config-linux: Convert classID from hex to uint32, opencontainers#296
* config-linux: Separate mknod from cgroups, opencontainers#298

Additions:

* config-linux: Add NoNewPrivileges setting for linux, opencontainers#290

Minor fixes and documentation:

* config-linux: clarify oom_score_adj, opencontainers#236, opencontainers#292
* config-linux: Update links to cgroups documentation, opencontainers#318
* config-linux: Remove pointers for slices preferring omitempty
  tag instead, opencontainers#316
* README: add runtime, bundle, and hook author user, opencontainers#280
* ROADMAP: reshuffled and split into GitHub issues, opencontainers#300, opencontainers#301,
  opencontainers#304, opencontainers#306
* style: Collect established styles in a discoverable location, opencontainers#287, opencontainers#311

Reminder: During the 0.x series of OCI releases we make no backwards

compatibility guarantees and intend to break the schema during this series.

An initial draft release, marking the milestone towards a stable 1.0.0

Reminder: During the 0.x series of OCI releases we make no backwards
compatibility guarantees and intend to break the schema during this series.