Update doc; ready for CRAN submission

Add back default support for parquet fix #315 (#444)

* Add back default support for parquet ref #315

* Bump ver.

Fix #425 (#426)

* Fix #425

no tests yet

* Add tests and Bürokratie

* Ik ben echt heel dom

* Windows bug?

Check on winbuilder

* How about this?

* How about this this

Update NEWS [no CI]

Fix #376 (#377)

* Fix #376

Did I forget anything?

* Update NEWS further [no ci]

Remove `gather_attrs` example [no ci]

Take more than 5s

Correct NEWS; add cran-comment.md to ignore [no ci]

Ready for release