Enhancements
* Add OS mimetypes DB to docker image, mainly for unstructured-api compat.
* Use the image registry as a cache when building Docker images.
* Adds the ability for `partition_text` to group together broken paragraphs.
* Added method to utils to allow date time format validation
Features
* Add Slack connector to pull messages for a specific channel
* Add --partition-by-api parameter to unstructured-ingest
* Added `partition_rtf` for processing rich text files.
* `partition` now accepts a `url` kwarg in addition to `file` and `filename`.
Fixes
* Allow encoding to be passed into `replace_mime_encodings`.
* unstructured-ingest connector-specific dependencies are imported on demand.
* unstructured-ingest --flatten-metadata supported for local connector.
* unstructured-ingest fix runtime error when using --metadata-include.