fix incorrect check

src/points.c

@@ -121,7 +121,7 @@ int main (int argc, char **argv) {
 		if (filename != NULL) {
 			free(filename);
 		}
-		if (opt > 3) {
+		if (opt > 4) {
 			// Only print this error if the file was able to be opened
 			fprintf(stderr, "Error: El archivo es corrupto!\n");
 		}