fix style

main.go

@@ -41,18 +41,18 @@ func main() {
 	app.Version = version
 	app.Flags = []cli.Flag{
 		cli.StringFlag{
-			Name: "registry",
-			Usage: "docker registry for login",
+			Name:   "registry",
+			Usage:  "docker registry for login",
 			EnvVar: "PLUGIN_REGISTRY",
 		},
 		cli.StringFlag{
-			Name: "username",
-			Usage: "username for login",
+			Name:   "username",
+			Usage:  "username for login",
 			EnvVar: "PLUGIN_USERNAME",
 		},
 		cli.StringFlag{
-			Name: "password",
-			Usage: "password for login",
+			Name:   "password",
+			Usage:  "password for login",
 			EnvVar: "PLUGIN_PASSWORD",
 		},
 	}
@@ -90,15 +90,15 @@ func run(c *cli.Context) error {
 
 	if err := creds.Store(types.AuthConfig{
 		ServerAddress: regName,
-		Username: user,
-		Password: pass,
+		Username:      user,
+		Password:      pass,
 	}); err != nil {
 		return err
 	}
 
 	if err := cf.Save(); err != nil {
 		return err
-	}	
+	}
 
 	fmt.Printf("Logged in via %s.\n", cf.Filename)