Zotero 7.* & 6.*

I've adapted the addon to Zotero 7.*, while preserving the compatibility with Zotero 6.*.

See https://www.zotero.org/support/dev/zotero_7_for_developers for more information.

It has been tested on Zotero 6.0.35 and 7.0.3.

Zotero 6.0.9

v0.0.2

Bump the addon version

Zotero 5.*

v0.0.1

Fix indentation typo