Bump 2.0.2

Signed-off-by: Joffrey F <joffrey@docker.com>

docker/version.py

-version = "2.0.1"
+version = "2.0.2"
 version_info = tuple([int(d) for d in version.split("-")[0].split(".")])

docs/change-log.md

 Change log
 ==========
 
+2.0.2
+-----
+
+[List of PRs / issues for this release](https://github.com/docker/docker-py/milestone/28?closed=1)
+
+### Bugfixes
+
+* Installation of the package now fails if the `docker-py` package is
+  installed in order to prevent obscure naming conflicts when both
+  packages co-exist.
+* Added missing `filters` parameter to `APIClient.networks`.
+* Resource objects generated by the `DockerClient` are now hashable.
+* Fixed a bug where retrieving untagged images using `DockerClient`
+  would raise a `TypeError` exception.
+* `mode` parameter in `create_service` is now properly converted to
+  a valid data type for the Engine API. Use `ServiceMode` for advanced
+  configurations.
+* Fixed a bug where the decoded `APIClient.events` stream would sometimes raise
+  an exception when a container is stopped or restarted.
+
 2.0.1
 -----