Add <iterator> include (#368)

MichaelChirico · web-flow · commit 1e903c0bda04 · 2023-04-24T11:26:35.000-05:00
std::back_inserter is used on L38: https://en.cppreference.com/w/cpp/iterator/back_insert_iterator
diff --git a/src/connection.cpp b/src/connection.cpp
@@ -1,3 +1,4 @@
+#include <iterator>
 #include <Rinternals.h>
 #include <vector>
 #include "xml2_utils.h"
