Syrupy

**Fixed**

- Add attrs package to declared dependencies

**Added**

- Line diff snapshot failures with colors and character highlighting

**Breaking Changes**
- Exit serialization early on detection of a cycle 78
- Fail unused snapshots unless `--snapshot-warn-unused` is passed as CLI flag 77

**Fixed**

- Add missing `typing_extensions` dependency to package setup.py 75

**Breaking Changes**
- Remove pyyaml serializer in favour of in-house Amber serializer 69
- Remove `snapshot(value)` syntax in favour of `assert snapshot ==` and `snapshot.assert_match` 68

**Fixed**
- Correctly update snapshots when targeting parameterized tests 64
- Remove pinned library dependencies 66

**Community**
- Include Apache OSS license into python package on pypi 65

**Fixed**
- Snapshotting multiline string and empty strings
- Support for snapshotting `None`, `false`, `0` and other falsy values