Release 2.0.0-alpha.4

• chore(lint): fix (b137976)
• test(mock): fix multiple onSnapshot for documents and collections in mock (b0ede7e)
• chore(jest): use even more ignore patterns (44f6f39)
• fix: use splice to set values in arrays (738059b)
• chore: remove old todos (ee79803)
• test(config): remove test files from coverage (f19a328)
• chore(lint): fix lint (faaf406)
• refactor(test): add item and empty docs by default (94aee8f)
• refactor(test): use isC: true (6a54ba1)
• refactor(test): manually bind refs on tests (5dd96c7)