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[List of PRs / issues for this release](https://github.com/docker/docker-py/milestone/51?closed=1)
Features
* The `APIClient` and `DockerClient` constructors now accept a `credstore_env`
parameter. When set, values in this dictionary are added to the environment
when executing the credential store process.
Bugfixes
* `DockerClient.networks.prune` now properly returns the operation's result
* Fixed a bug that caused custom Dockerfile paths in a subfolder of the build
context to be invalidated, preventing these builds from working
* The `plugin_privileges` method can now be called for plugins requiring
authentication to access
* Fixed a bug that caused attempts to read a data stream over an unsecured TCP
socket to crash on Windows clients
* Fixed a bug where using the `read_only` parameter when creating a service using
the `DockerClient` was being ignored
* Fixed an issue where `Service.scale` would not properly update the service's
mode, causing the operation to fail silently