The Washington Post released its year end books package on Thursday, including its top 10 Best Books of the 2020 list: Caste, by Isabel Wilkerson Hidden Valley Road, by Robert Kolker Memorial Drive, by Natasha Trethewey Unworthy Republic, by Claudio Saunt Vesper Flights, by Helen Macdonald The Cold Millions, by Jess Walter Hamnet, by Maggie…