v2.1.2 v2-RC-1.1 v2-RC-1 v1.0.6 v1.0.6-rc3 v1.0.6-rc2 v1.0.6-rc v1.0.2 V2RC1.4 V2RC1.3 V2RC1.2 CRAN_Release_1 2.0 1.0.3 1.0.1