bump v2

go.mod

@@ -14,4 +14,4 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 )
 
-retract v7.1.2+incompatible
+// retract v7.1.2+incompatible

protoc-gen-twirp_ruby/main.go

@@ -28,7 +28,7 @@ import (
 	descriptor "google.golang.org/protobuf/types/descriptorpb"
 	plugin "google.golang.org/protobuf/types/pluginpb"
 
-	"github.com/github/twirp-ruby/internal/gen/typemap"
+	"github.com/github/twirp-ruby/v2/internal/gen/typemap"
 )
 
 func main() {