- Improved support for credentials stores on Windows to include binaries using
  extensions other than `.exe`. The list of valid extensions is determined by
  the contents of the `PATHEXT` environment variable.

- Fixed a bug where Compose would generate invalid binds containing duplicate
  elements with some v3.2 files, triggering errors at the Engine level during
  deployment.

## 1.21.0

(2018-04-11)

### New features

#### Compose file version 2.4

- Introduced version 2.4 of the `docker-compose.yml` specification.
  This version requires Docker Engine 17.12.0 or above.

- Added support for the `platform` parameter in service definitions.
  If supplied, the parameter is also used when performing build for the
  service.

#### Compose file version 2.2 and up

- Added support for the `cpu_rt_period` and `cpu_rt_runtime` parameters
  in service definitions (2.x only).

#### Compose file version 2.1 and up

- Added support for the `cpu_period` parameter in service definitions
  (2.x only).

- Added support for the `isolation` parameter in service build configurations.
  Additionally, the `isolation` parameter in service definitions is used for
  builds as well if no `build.isolation` parameter is defined. (2.x only)

#### All formats

- Added support for the `--workdir` flag in `docker-compose exec`.

- Added support for the `--compress` flag in `docker-compose build`.

- `docker-compose pull` is now performed in parallel by default. You can
  opt out using the `--no-parallel` flag. The `--parallel` flag is now
  deprecated and will be removed in a future version.

- Dashes and underscores in project names are no longer stripped out.

- `docker-compose build` now supports the use of Dockerfile from outside
  the build context.

### Bug fixes

- Compose now checks that the volume's configuration matches the remote
  volume, and errors out if a mismatch is detected.

- Fixed a bug that caused Compose to raise unexpected errors when attempting
  to create several one-off containers in parallel.

- Fixed a bug with argument parsing when using `docker-machine config` to
  generate TLS flags for `exec` and `run` commands.

- Fixed a bug where variable substitution with an empty default value
  (e.g. `${VAR:-}`) would print an incorrect warning.

- Improved resilience when encoding of the Compose file doesn't match the
  system's. Users are encouraged to use UTF-8 when possible.

- Fixed a bug where external overlay networks in Swarm would be incorrectly
  recognized as inexistent by Compose, interrupting otherwise valid
  operations.

## 1.20.0

(2018-03-20)

### New features

#### Compose file version 3.6

- Introduced version 3.6 of the `docker-compose.yml` specification.
  This version must be used with Docker Engine 18.02.0 or above.

- Added support for the `tmpfs.size` property in volume mappings

#### Compose file version 3.2 and up

- The `--build-arg` option can now be used without specifying a service
  in `docker-compose build`

#### Compose file version 2.3

- Added support for `device_cgroup_rules` in service definitions

- Added support for the `tmpfs.size` property in long-form volume mappings

- The `--build-arg` option can now be used without specifying a service
  in `docker-compose build`

#### All formats

- Added a `--log-level` option to the top-level `docker-compose` command.
  Accepted values are `debug`, `info`, `warning`, `error`, `critical`.
  Default log level is `info`

- `docker-compose run` now allows users to unset the container's entrypoint

- Proxy configuration found in the `~/.docker/config.json` file now populates
  environment and build args for containers created by Compose

- Added the `--use-aliases` flag to `docker-compose run`, indicating that
  network aliases declared in the service's config should be used for the
  running container

- Added the `--include-deps` flag to `docker-compose pull`

- `docker-compose run` now kills and removes the running container upon
  receiving `SIGHUP`

- `docker-compose ps` now shows the containers' health status if available