moved stringify() out of detail namespace
also fixed the DOCTEST_CONFIG_DISABLE builds with custom overloads
diff --git a/examples/dev_testing/main.cpp b/examples/dev_testing/main.cpp
index fdf6569..efab386 100644
--- a/examples/dev_testing/main.cpp
+++ b/examples/dev_testing/main.cpp
@@ -1,10 +1,11 @@
//#define DOCTEST_CONFIG_DISABLE
-//#include "doctest.h"
+#include "doctest.h"
#define DOCTEST_CONFIG_IMPLEMENT
#include "doctest.h"
#include <cstdio>
+#include <cstdlib>
int main(int argc, char** argv) {
// initialize