Added @ryanrdetzel for docs fix #674. Thanks!

docs/topics/credits.md

@@ -104,6 +104,7 @@ The following people have helped make REST framework great.
 * Xavier Ordoquy - [xordoquy]
 * Adam Wentz - [floppya]
 * Andreas Pelme - [pelme]
+* Ryan Detzel - [ryanrdetzel]
 
 Many thanks to everyone who's contributed to the project.
 
@@ -242,3 +243,4 @@ You can also contact [@_tomchristie][twitter] directly on twitter.
 [xordoquy]: https://github.com/xordoquy
 [floppya]: https://github.com/floppya
 [pelme]: https://github.com/pelme
+[ryanrdetzel]: https://github.com/ryanrdetzel