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