add release dates for 8.6.x releases
# Changelog
-## 8.6.2 (not yet released)
+## 8.6.2 (released May 31, 2017)
### Bugfixes
- ContainerRegistryAuthSupplier should ignore exceptions in refreshing the
[773]: https://github.com/spotify/docker-client/pull/773
-## 8.6.1
+## 8.6.1 (released May 31, 2017)
Added NetworkConfig.Attachable.
[768](https://github.com/spotify/docker-client/issues/768) [770](https://github.com/spotify/docker-client/issues/770)
-## 8.6.0
+## 8.6.0 (released May 26, 2017)
### Revamped support for authentication
This version introduces a new way to configure DefaultDockerClient to use
