Make description optional in info command (#165)

Some videos have humongous descriptions, this can make the output harder to read.

cmd/youtubedr/info.go

@@ -46,7 +46,9 @@ var outputWriters = map[string]outputWriter{
 		fmt.Println("Title:      ", info.Title)
 		fmt.Println("Author:     ", info.Author)
 		fmt.Println("Duration:   ", info.Duration)
-		fmt.Println("Description:", info.Description)
+		if printDescription {
+			fmt.Println("Description:", info.Description)
+		}
 		fmt.Println()
 
 		table := tablewriter.NewWriter(os.Stdout)
@@ -122,8 +124,10 @@ var infoCmd = &cobra.Command{
 }
 
 var outputFormat string
+var printDescription bool
 
 func init() {
 	rootCmd.AddCommand(infoCmd)
-	infoCmd.Flags().StringVarP(&outputFormat, "format", "f", "plain", "The output format (plain/json/xml).")
+	infoCmd.Flags().StringVarP(&outputFormat, "format", "f", "plain", "The output format (plain/json/xml)")
+	infoCmd.Flags().BoolVarP(&printDescription, "description", "d", false, "Print description")
 }