Update CHANGELOG for 0.17.8
-## 0.17.8 (Unreleased)
+## 0.17.9 (Unreleased)
+
+### Improvements
+
+## 0.17.8 (Released April 23, 2019)
### Improvements
ignore for purposes of updates or replacements. [#2657](https://github.com/pulumi/pulumi/pull/2657)
- Fix an engine bug that could lead to incorrect interpretation of the previous state of a resource leading to
unexpected Update, Replace or Delete operations being scheduled. [#2650]https://github.com/pulumi/pulumi/issues/2650)
+- Build/push `pulumi/actions` container to [DockerHub](https://hub.docker.com/r/pulumi/actions) with new SDK releases [#2646](https://github.com/pulumi/pulumi/pull/2646)
## 0.17.7 (Released April 17, 2019)
