Add date to 0.8.3 release note
# Release Notes
-## v0.8.3 -
+## v0.8.3 - 2022-04-19
- Added `.file_type` attribute to {class}`pangeo_forge_recipes.patterns.FilePattern`. This attribute will eventually supercede
`.is_opendap`, which will be deprecated in `0.9.0`. Until then, `FilePattern(..., is_opendap=True)` is supported as equivalent
