As of Go 1.16, there is now a retract directive in the module system.

From my quick-ish reading of things (https://go.dev/ref/mod#go-mod-file-retract), it seems that maybe the way to make end-users' lives a little easier is to publish a v2.0.1 with something like the following in the go.mod file:

retract (
    v2.0.0 // Published accidentally.
    v2.0.1 // Contains retractions only.
)