Add 0.9.1 release notes [skip ci]
### Added
+## [0.9.1](https://github.com/MarquezProject/marquez/releases/tag/0.9.0) - 2020-01-05
+
+### Added
+
+* Add redshift data types
+* Add links to dropwizard overrides in `config.yml`
+
## [0.9.0](https://github.com/MarquezProject/marquez/releases/tag/0.9.0) - 2020-01-05
### Added
