fix versioning

cmd/url-parser/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/sirupsen/logrus"
@@ -8,14 +9,20 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
-// Version of current build
-var Version = "devel"
+var (
+	BuildVersion = "devel"
+	BuildDate    = "00000000"
+)
 
 func main() {
+	cli.VersionPrinter = func(c *cli.Context) {
+		fmt.Printf("%s version=%s date=%s\n", c.App.Name, c.App.Version, BuildDate)
+	}
+
 	app := cli.NewApp()
 	app.Name = "url-parser"
 	app.Usage = "Parse URL and shows the part of it."
-	app.Version = Version
+	app.Version = BuildVersion
 	app.Action = command.Run
 	app.Flags = globalFlags()
 	app.Commands = configCommands()