Fixed KAT URL
Upgraded requests to 2.5.0
Add support for Old Pirate Bay.

Note that this only downloads magnet links and you have to provide the URL yourself, because OPB is meant to be 'open'.
Show all search results when clicking 'Choose Specific Release'.

This effectively shows all results, even the ones without enough seeds and/or quality. However, they are marked.
Updated CHANGELOG.md