Update changelog for v2.7.5 release
## HEAD (Unreleased)
+## 2.7.5 (December 16, 2020)
+
- Add enum for kubernetes.core.v1.Service.Spec.Type (https://github.com/pulumi/pulumi-kubernetes/pull/1408)
- Update pulumi deps to v2.15.5 (https://github.com/pulumi/pulumi-kubernetes/pull/1402)
- Fix Go resource Input/Output methods (https://github.com/pulumi/pulumi-kubernetes/pull/1406)
