Merge pull request nlohmann#6 from nlohmann/develop

Sync Fork from Upstream Repo

Author: sthagen

README.md

@@ -1339,7 +1339,7 @@ The library itself consists of a single header file licensed under the MIT licen
 - [**send_to_wandbox**](https://github.com/nlohmann/json/blob/develop/doc/scripts/send_to_wandbox.py) to send code examples to [Wandbox](http://melpon.org/wandbox)
 - [**Travis**](https://travis-ci.org) for [continuous integration](https://travis-ci.org/nlohmann/json) on Linux and macOS
 - [**Valgrind**](http://valgrind.org) to check for correct memory management
-- [**Wandbox**](http://melpon.org/wandbox) for [online examples](https://wandbox.org/permlink/TarF5pPn9NtHQjhf)
+- [**Wandbox**](http://melpon.org/wandbox) for [online examples](https://wandbox.org/permlink/3lCHrFUZANONKv7a)
 
 
 ## Projects using JSON for Modern C++