"Go1 2.0" is meaningless, Go X refers to Go X.Y.Z. Many FOSS programs treat X, Y and Z as numbers rather than digits, and increment X when there is a breaking change in the API or some serious restructuring/change (this is starting to change, recently we see programs incrementing major version periodically [most remarkably, Linux, Firefox, GCC have jumped on this bandwagon], these days only FOSS libraries are seriously sticking to that.) so yeah, it's probably going to be 1.10 and so on.