Update PDF.js
=============

To update PDF.js:

1. Go to https://github.com/mozilla/pdf.js/releases/latest and download the
   ``pdfjs-<VERSION>-dist.zip`` file.

2. Remove the old files::

    git rm -r asset/vendor/pdf.js

3. Extract the .zip file contents inside ``asset/vendor/pdf.js``::

    unzip pdfjs-<VERSION>-dist.zip -d asset/vendor/pdf.js

4. Edit ``asset/vendor/pdf.js/web/viewer.js`` and add
   ``window.location.origin`` to ``HOSTED_VIEWER_ORIGINS``. It should look like
   this::

    const HOSTED_VIEWER_ORIGINS = ["null", "http://mozilla.github.io", "https://mozilla.github.io", window.location.origin];

5. Commit! ::

    git add asset/vendor/pdf.js && git commit -m 'Update PDF.js to <VERSION>'