update demo

Author: fuli

src/btree_demo.cpp

@@ -6,7 +6,7 @@ int main(void) {
 	BTree x("./btree.dat");
 	int32_t i;
 
-	for (i=0;i<1024;i++) {
+	for (i=0;i<100000;i++) {
 		x.Insert(i);	
 		int32_t r = x.Search(i);
 		printf("idx[%d]\n", r);