Add 0.10.4 release notes [skip ci]
### Added
+## [0.10.4](https://github.com/MarquezProject/marquez/releases/tag/0.10.4) - 2020-01-17
+
+### Fixed
+
+* Fix `RunState.isComplete()`
+
## [0.10.3](https://github.com/MarquezProject/marquez/releases/tag/0.10.3) - 2020-01-17
### Added
