Releases for PDF

Issue #2971120: Extra options for PDF.JS Viewer
Issue #3076198: Allow users to specify a custom viewer.html file
Issue #3135615: Add Drupal 9 compatibility
Issue #3158368: Update to work with the latest version of PDF.js.
If you are using PDF.js older than 2.0.491, please update it to avoid the XSS vulnerability CVE-2018-5158.

fix version detection with pdf.js v1.8.x

Allow to resize PDF Thumbnail

use pre-built pdf.js (http://mozilla.github.io/pdf.js/getting_started/) instead of the dev from git
use hook_library_info https://drupal.org/node/2275967

add textlayer support for text selecting
Thanks to https://github.com/jviereck/pdfListView

Add a simple list view to render a PDF document with the latest pdf.js

formal release

The first stable release after no critical issue for a while

Fix bugs

This is the first dev release.