2019-09 IA Bulk Dump Update

I ran another bulk dump using the scripts in this repository. The scrape started on 2019-09-09 and ended around 2019-10-05, yielding 107,151,607 DOIs. The xz compressed file is 46 GBytes.

Available at: https://archive.org/details/crossref_doi_dump_201909

SHA-256:

338e01b613f34624a3408f781fecf746e7fc1ce6e4636186e57775d18d2a6ebc crossref-works.2019-09-09.json.xz

Updating the README with a link might make sense, as this repository is the top hit for "Crossref Metadata Bulk Dump" (at least with my search filters).

I would encourage any future folks using these dumps to switch over to Daniel Ecer's dumps posted to figshare more frequently:
https://figshare.com/articles/Crossref_Works_Dump_-_August_2019/9751865