Prepare for v3.9.1 release
CHANGELOG
=========
+## 3.9.1 (2021-07-29)
+
+### Bug Fixes
+
+- [cli] - Respect provider aliases
+ [#7166](https://github.com/pulumi/pulumi/pull/7166)
+
+- [cli] - `pulumi stack ls` now returns all accessible stacks (removing
+ earlier cap imposed by the httpstate backend).
+ [#3620](https://github.com/pulumi/pulumi/issues/3620)
+
+- [sdk/go] - Fix panics caused by logging from `ApplyT`, affecting
+ `pulumi-docker` and potentially other providers
+ [#7661](https://github.com/pulumi/pulumi/pull/7661)
+
+- [sdk/python] - Handle unknown results from methods.
+ [#7677](https://github.com/pulumi/pulumi/pull/7677)
+
## 3.9.0 (2021-07-28)
### Improvements
