Add a link to the reference page in case it's down (as it is now)

![image](https://user-images.githubusercontent.com/419355/149551368-68f3541c-afea-4a36-9f5c-b56607d75c73.png)

Signed-off-by: Ashton Von Honnecke <ashton@pixelstub.com>

Author: ahonnecke

README.md

@@ -170,3 +170,5 @@ External Examples
 =================
 
 - [Wesley Tanaka - Structured log files in Python using python-json-logger](https://wtanaka.com/node/8201)
+
+- [Archive](https://web.archive.org/web/20201130054012/https://wtanaka.com/node/8201)