added the "main" section to the README

main.c

@@ -108,7 +108,7 @@ int main(int argc, char *argv[]) {
             #if EXT_PROMPT
               if (! executeBuiltin(cmd, &status, &debug)) {
             #else
-            if (!executeBuiltin(cmd, &status)) {
+              if (!executeBuiltin(cmd, &status)) {
             #endif
               do_loop = false;
               cpy = NULL;