In this version I implement a features, requested by a user:
* Infinite scroll in result lists, allow you to see more than 50 results. As you scroll towards the bottom the app will start load an additional 50 records. You will see an appropriate indicator
Additionally:
* Added option to only use “unaypwall.org” instead of both “unpaywall.org” and “core.ac.uk Discovery”
* Changed version numbering away from more traditional major version dot minor version to year dot release notation
2019.9
