fix(flushMicroTasks): fallback to no scheduler (testing-library#739)

Co-authored-by: Kent C. Dodds <me+github@kentcdodds.com>

docs: add MatanBobi as a contributor (testing-library#733)

* docs: update README.md

* docs: update .all-contributorsrc

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fix(cleanup): Cleanup should flush microtask queue after unmount (tes…

…ting-library#632)

fix(cleanup): microtask flushing now supports fake timers (testing-li…

…brary#720)

chore: remove deprecated assertion

feat: force update of @testing-library/dom

docs: add weyert as a contributor (testing-library#712)

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* docs: update .all-contributorsrc

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docs: add kettanaito as a contributor (testing-library#699)

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docs: add screendriver as a contributor (testing-library#692)

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docs: add samtsai as a contributor (testing-library#691)

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* docs: update .all-contributorsrc

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