Betty 0.4.11

What's Changed

• Restructure module function tests to prevent collisions with class tests by @bartfeenstra in #2415
• Allow configuration to be marked immutable by @bartfeenstra in #2414
• Make some test fixtures synchronous to avoid event loop fixture scope mismatches by @bartfeenstra in #2416
• Add EntityCollectionTestBase by @bartfeenstra in #2419
• Restructure class method tests for consistency with module function tests by @bartfeenstra in #2420
• Allow entities to be marked immutable by @bartfeenstra in #2417

Full Changelog: 0.4.10...0.4.11