Replace `NullStore` with `InMemoryFeedStore` · finebel/EssentialFeed@4c07a17

xcbeautify 2.3.1 is already installed and up-to-date. To reinstall 2.3.1, run: brew reinstall xcbeautify

Tests Passed: 0 failed, 0 skipped, 168 total (3.715 seconds)

Tests Passed: 0 failed, 0 skipped, 111 total (1.628 seconds)