add PR 850 / guava relocation to changelog
## 8.8.4
-Not yet released
+Released August 8, 2017
+- [The "shaded" artifact for docker-client][README.md#a-note-on-shading]
+ additionally relocates `com.google.guava:guava` classes, to try to
+ help avoid conflicts for users that depend on incompatible versions
+ of Guava. ([850][])
- Upgrade Google Guava to 20.0 ([792][])
[792]: https://github.com/spotify/docker-client/pull/792
+[850]: https://github.com/spotify/docker-client/pull/850
## 8.8.3
