Clarified some outcomes in issues.go

cmd/issues.go

@@ -25,7 +25,7 @@ func main() {
 				os.Exit(1)
 			}
 		} else {
-			fmt.Println("Not enough arguments:", arg)
+			fmt.Println("No issues folder detected.\nNot enough arguments:", arg)
 			os.Exit(1)
 		}
 	}