Mark expired cfp as closed

[blablatdinov]

ref: #64

[blablatdinov]

@yegor256 Try rerun workflow manually, pls. Tests fail because code coverege down. However, locally I take 100% test coverage

[blablatdinov]

@yegor256 sorry, tests.sh run update fixtures dir and mark expired dates as closed, so python tests not check expired date case. Take a look

[yegor256]

@blablatdinov do I understand correctly that the conferences with expired "cfp" won't be rendered in the table at all?

[blablatdinov]

@yegor256 No, trey are rendered as "closed", check test case

[yegor256]

@blablatdinov thanks!