Update module/import paths for v2

go.mod

diff --git a/go.mod b/go.mod
index 10605a6..52dcd6b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/cespare/xxhash
+module github.com/cespare/xxhash/v2
 
 require (
 	github.com/OneOfOne/xxhash v1.2.2

xxhsum/xxhsum.go

diff --git a/xxhsum/xxhsum.go b/xxhsum/xxhsum.go
index aa57716..0b7e4f0 100644
--- a/xxhsum/xxhsum.go
+++ b/xxhsum/xxhsum.go
@@ -5,7 +5,7 @@
 	"io"
 	"os"
 
-	"github.com/cespare/xxhash"
+	"github.com/cespare/xxhash/v2"
 )
 
 func main() {