Update 'devel' flag usage in outdated Cmd

Signed-off-by: Emanuel Bennici <eb@fabmation.de>

cmd/helm/outdated.go

@@ -69,8 +69,7 @@ func newOutdatedCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 	}
 
 	flags := cmd.Flags()
-	flags.BoolVarP(&client.AllNamespaces, "all-namespaces", "A", false, "list releases across all namespaces")
+	flags.Bool("devel", false, "use development versions (alpha, beta, and release candidate releases), too. Equivalent to version '>0.0.0-0'.")
-	flags.Bool("devel", false, "use development versions (alpha, beta, and release candidate releases), too. Equivalent to version '>0.0.0-0'. If --version is set, this is ignored")
 	bindOutputFlag(cmd, &outfmt)
 
 	return cmd