What to read while you’re self-isolating to avoid the coronavirus? How about books about all the various plagues humankind has survived before?There are classics like Giovanni Boccaccio’s 1353 classic “The Decameron,” about Italian aristocrats who flee the bubonic plague in Florence, or Daniel Defoe’s 1722 novel “A Journal of the Plague Year,” an account of the Black Death in London half a century before.