Merge pull request cpp-best-practices#137 from pi-guy-in-the-sky/patch-1

Update 04-Considering_Safety.md

Author: lefticus

04-Considering_Safety.md

@@ -142,4 +142,4 @@ If you have the possibility to use a compiler that supports C++11, you can use v
 
 ## Additional Resources
 
-[How to Prevent The Next Heartbleed](http://www.dwheeler.com/essays/heartbleed.html) by David Wheeler is a good analysis of the current state of code safety and how to ensure safe code.
+[How to Prevent The Next Heartbleed](https://dwheeler.com/essays/heartbleed.html) by David Wheeler is a good analysis of the current state of code safety and how to ensure safe code.