Another small edit to the README
diff --git a/README.md b/README.md
index 222a207..301c53f 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@
 ```CPP
 #include <delaunator.hpp>
 #include <cstdio>
-using namespace std;
+
 //...
 int main(int, char* argv[]) {
     //...