versions of Python 3

- Fixed a bug where the output of `docker-compose config` would sometimes
  contain invalid port definitions

## 1.13.0

(2017-05-02)

### Breaking changes

- `docker-compose up` now resets a service's scaling to its default value.
  You can use the newly introduced `--scale` option to specify a custom
  scale value

### New features

#### Compose file version 2.2

- Introduced version 2.2 of the `docker-compose.yml` specification. This
  version requires to be used with Docker Engine 1.13.0 or above

- Added support for `init` in service definitions.

- Added support for `scale` in service definitions. The configuration's value
  can be overridden using the `--scale` flag in `docker-compose up`.
  The `scale` command is disabled for this file format

#### Compose file version 2.x

- Added support for `options` in the `ipam` section of network definitions

### Bug fixes

- Fixed a bug where paths provided to compose via the `-f` option were not
  being resolved properly

- Fixed a bug where the `ext_ip::target_port` notation in the ports section
  was incorrectly marked as invalid

- Fixed an issue where the `exec` command would sometimes not return control
  to the terminal when using the `-d` flag

- Fixed a bug where secrets were missing from the output of the `config`
  command for v3.2 files

- Fixed an issue where `docker-compose` would hang if no internet connection
  was available

- Fixed an issue where paths containing unicode characters passed via the `-f`
  flag were causing Compose to crash

- Fixed an issue where the output of `docker-compose config` would be invalid
  if the Compose file contained external secrets

- Fixed a bug where using `--exit-code-from` with `up` would fail if Compose
  was installed in a Python 3 environment

- Fixed a bug where recreating containers using a combination of `tmpfs` and
  `volumes` would result in an invalid config state

## 1.12.0

(2017-04-04)

### New features

#### Compose file version 3.2

- Introduced version 3.2 of the `docker-compose.yml` specification

- Added support for `cache_from` in the `build` section of services

- Added support for the new expanded ports syntax in service definitions

- Added support for the new expanded volumes syntax in service definitions

#### Compose file version 2.1

- Added support for `pids_limit` in service definitions

#### Compose file version 2.0 and up

- Added `--volumes` option to `docker-compose config` that lists named
  volumes declared for that project

- Added support for `mem_reservation` in service definitions (2.x only)

- Added support for `dns_opt` in service definitions (2.x only)

#### All formats

- Added a new `docker-compose images` command that lists images used by
  the current project's containers

- Added a `--stop` (shorthand `-s`) option to `docker-compose rm` that stops
  the running containers before removing them

- Added a `--resolve-image-digests` option to `docker-compose config` that
  pins the image version for each service to a permanent digest

- Added a `--exit-code-from SERVICE` option to `docker-compose up`. When
  used, `docker-compose` will exit on any container's exit with the code
  corresponding to the specified service's exit code

- Added a `--parallel` option to `docker-compose pull` that enables images
  for multiple services to be pulled simultaneously

- Added a `--build-arg` option to `docker-compose build`

- Added a `--volume <volume_mapping>` (shorthand `-v`) option to
  `docker-compose run` to declare runtime volumes to be mounted

- Added a `--project-directory PATH` option to `docker-compose` that will
  affect path resolution for the project

- When using `--abort-on-container-exit` in `docker-compose up`, the exit
  code for the container that caused the abort will be the exit code of
  the `docker-compose up` command

- Users can now configure which path separator character they want to use
  to separate the `COMPOSE_FILE` environment value using the