ER update

[bambooforest]

For the CLDF dump:

• add a URL to Erich's contribution (https://zenodo.org/record/3464333#.XZHxJOczZ0t)
• expand the description field:

An explicitly typological dataset which seeks to deal even-handedly with numerous issues that arise in the cross-linguistic comparison of Australian phoneme inventories. To understand how it was created, and how and why the inventories will appear to differ from the ultimate source documents, please read the accompanying notes (see citation).