refactor: change package name to match the fork URL and update the README with a notice and install command

cmd/check/main.go

@@ -16,8 +16,8 @@ import (
 	"path/filepath"
 	"strings"
 
+	tag "git.radioz.org/pisoj/dhowden-tag"
 	"github.com/dhowden/itl"
-	"github.com/dhowden/tag"
 )
 
 func decodeLocation(l string) (string, error) {

cmd/sum/main.go

@@ -12,7 +12,7 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/dhowden/tag"
+	tag "git.radioz.org/pisoj/dhowden-tag"
 )
 
 func main() {

cmd/tag/main.go

@@ -13,8 +13,8 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/dhowden/tag"
-	"github.com/dhowden/tag/mbz"
+	tag "git.radioz.org/pisoj/dhowden-tag"
+	"git.radioz.org/pisoj/dhowden-tag/mbz"
 )
 
 var usage = func() {