Bump 4.2.0

Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>

docker/version.py

@@ -1,2 +1,2 @@
-version = "4.2.0-dev"
+version = "4.2.0"
 version_info = tuple([int(d) for d in version.split("-")[0].split(".")])

docs/change-log.md

@@ -1,6 +1,23 @@
 Change log
 ==========
 
+4.2.0
+-----
+
+[List of PRs / issues for this release](https://github.com/docker/docker-py/milestone/63?closed=1)
+
+### Bugfixes
+
+- Fix `win32pipe.WaitNamedPipe` throw exception in Windows containers
+- Use `Hostname`, `Username`, `Port` and `ProxyCommand` settings from `.ssh/config` when on SSH
+- Set host key policy for ssh transport to `paramiko.WarningPolicy()`
+- Set logging level of `paramiko` to warn
+
+### Features
+
+- Add support for docker contexts through `docker.ContextAPI`
+
+
 4.1.0
 -----