Merge pull request #249 from bimoware/master

Replaced dead links

Author: viblo

docs/src/overview.rst

@@ -172,9 +172,9 @@ is best for a particular program depends on the requirements.
 
 Some good articles:
 
-* http://gameprogrammingpatterns.com/game-loop.html
-* http://gafferongames.com/game-physics/fix-your-timestep/
-* http://www.koonsolo.com/news/dewitters-gameloop/
+* https://gameprogrammingpatterns.com/game-loop.html
+* https://gafferongames.com/post/fix_your_timestep/
+* https://gamedevfaqs.com/managing-consistent-game-physics-the-case-for-fixed-time-steps
 
 
 Object tunneling
@@ -314,4 +314,4 @@ a C-library.
 
 For the backstory of why Pymunk exists there's a short post about the 
 background and history including a screenshot of the first game made with 
-Pymunk on my own website, at https://www.viblo.se/projects/pymunk/ 
+Pymunk on my own website, at https://www.viblo.se/projects/pymunk/