0.3.0 - Leaderboard management

What's Changed

• Modify tests to check the whole response body by @tudddorrr in #48
• Add missing migration for cascade delete player events by @tudddorrr in #49
• Named migrations by @tudddorrr in #50
• Make leaderboard entries exportable by @tudddorrr in #51
• Leaderboard entries can be hidden/unhidden by @tudddorrr in #52
• Make leaderboards updatable by @tudddorrr in #53
• Filter out hidden leaderboard entries from API requests by @tudddorrr in #55

Full Changelog: 0.2.0...0.3.0