Made issues.go check for too many arguments

cmd/issues.go

@@ -20,10 +20,14 @@ func main() {
 		fmt.Println("Not enough arguments:", arg)
 		os.Exit(1)
 	}
+	if len(arg) > 1 {
+		fmt.Println("Too many arguments:", arg)
+		os.Exit(1)
+	}
 
 	fileInfo, err := os.Stat(arg[0])
 	if err != nil {
-		fmt.Println("could not run program:", err)
+		fmt.Println("error parsing argument:", err)
 		os.Exit(1)
 	}