Merge pull request #2193 from dota17/issue#2059

Fix consistency in function `int_to_string()`

include/nlohmann/detail/iterators/iteration_proxy.hpp

@@ -15,7 +15,9 @@ namespace detail
 template<typename string_type>
 void int_to_string( string_type& target, std::size_t value )
 {
-    target = std::to_string(value);
+    // For ADL
+    using std::to_string;
+    target = to_string(value);
 }
 template <typename IteratorType> class iteration_proxy_value
 {