Corrected usage message

README.md

@@ -83,7 +83,7 @@ When accessed, this endpoint returns a JSON document listing every file served,
 ## Usage output
 ```
 Usage:
-  roulette <path> [path2]... [flags]
+  roulette <path> [path]... [flags]
   roulette [command]
 
 Available Commands:

cmd/root.go

@@ -33,7 +33,7 @@ var Sort bool
 var Verbose bool
 
 var rootCmd = &cobra.Command{
-	Use:   "roulette <path> [path2]...",
+	Use:   "roulette <path> [path]...",
 	Short: "Serves random images from the specified directories.",
 	Args:  cobra.MinimumNArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {