Discogs-alert

+ Fixed fake-useragent HTML-parsing bug
+ Fixed Discogs-list-as-wantlist functionality
+ _Major_ codebase refactor
+ Updated dependencies

- adjust currency conversion API (3rd party service closed down)
- fix bug when converting currency for prices >1000
- small docs changes

That bug is fixed for real this time, using rotating user agents and Selenium. It makes the loop running a bit slower, but it seems the only way to get around Discog's request provenance checks.

- Added support for using a Discogs list as a wantlist (rather than a local JSON file).
- Fixed a 403 authentication bug
- Fixed a small issue with releases containing no listed sleeve condition.

First release! Only one notification option right now, + have to manually write wantlist items in a JSON file, but the core service is ready. Once running, the service reads each wantlist item every minute, queries the Discogs marketplace according to the conditions/filters specified by the user, and sends them a notification if any release they are looking for is now for sale according to their conditions.