Add Google's cache version of url giving a 500

Author: webpro

README.md

@@ -6,8 +6,10 @@ you during design, discussion, or review. The list is incomplete, and sometimes
 trade-offs need to be made between conflicting principles. However, higher
 ranked principles usually beat lower ranked ones.
 
-The list was inspired by
-[The Principles of Good Programming](https://www.artima.com/weblogs/viewpost.jsp?thread=331531).
+The list was inspired by <!-- markdown-link-check-disable-next-line -->
+[The Principles of Good Programming](https://www.artima.com/weblogs/viewpost.jsp?thread=331531)
+(down?
+[Google's cache](https://webcache.googleusercontent.com/search?q=cache:KU51T8hZ-0kJ:https://www.artima.com/weblogs/viewpost.jsp%3Fthread%3D331531+&cd=1&hl=en&ct=clnk&gl=nl&client=pub-3911176865765226)).
 I've added a bit more reasoning, details, and links to further resources.
 [Let me know](https://github.com/webpro/programming-principles/issues) if you
 have any feedback or suggestions for improvement!