Fastobo

Changed
- Updated to `fastobo` [v0.6.0](https://github.com/fastobo/fastobo/blob/master/CHANGELOG.md#v060---2019-07-23).
Fixed
- Parser now accepts ISO 8601 dates with fractional second.

Changed
- Updated to `fastobo` [v0.5.0](https://github.com/fastobo/fastobo/blob/master/CHANGELOG.md#v050---2019-07-15).
Added
- Support for OBO graph deserialization using `fastobo-graphs`.
- Limited support for instance frames in `fastobo.instance` module.
- Methods `OboDoc.compact_ids` and `OboDoc.decompact_ids` to create semantically
equivalent OBO document with compacted/decompacted identifiers.

Fixed
- PyPI release not being uploaded because of older development release.

Initial release.