NEXT Add validateCertificate for ClientSetting. [2.0.0] support dio 4.0.0 [2.0.0-beta2] support null-safety support dio 4.x [1.0.1] - 2020.8.7 merge #760 [1.0.0] - 2019.9.18 Support redirect [0.0.2] - 2019.9.17 A Dio HttpAdapter which support Http/2.0.