Update changelog for 5.0.2 release

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

docker/version.py

diff --git a/docker/version.py b/docker/version.py
index 5687086..fa3ea92 100644
--- a/docker/version.py
+++ b/docker/version.py
@@ -1,2 +1,2 @@
-version = "5.1.0-dev"
+version = "5.0.2"
 version_info = tuple(int(d) for d in version.split("-")[0].split("."))

docs/change-log.md

diff --git a/docs/change-log.md b/docs/change-log.md
index 441e91d..2ff0774 100644
--- a/docs/change-log.md
+++ b/docs/change-log.md
@@ -1,6 +1,14 @@
 Change log
 ==========
 
+5.0.2
+-----
+
+[List of PRs / issues for this release](https://github.com/docker/docker-py/milestone/75?closed=1)
+
+### Bugfixes
+- Fix `disable_buffering` regression
+
 5.0.1
 -----