fix: (bash) completion script is broken

The generated completion shell for at least bash is broken, the
completion for other shells I haven't tested.

Because the Use string was not set for the root command, an empty string
was used in the generated completion script.
This causes the completion script to not execute because among others
the command "complete -o default -F __start_" fails
because the command name parameter is missing.

internal/cmd/root.go

@@ -13,6 +13,7 @@ func newRoot() *cobra.Command {
 	const shortDesc = "Visualize Dependencies and generate deployment orders"
 
 	root := &cobra.Command{
+		Use:          "dependencies-tool COMMAND",
 		Short:        shortDesc,
 		SilenceUsage: true,
 		Version:      version,