Added @fernandogrd for bugfix #632. Thanks!

docs/topics/credits.md

@@ -100,6 +100,7 @@ The following people have helped make REST framework great.
 * Michael Elovskikh - [wronglink]
 * Michał Jaworski - [swistakm]
 * Andrea de Marco - [z4r]
+* Fernando Rocha - [fernandogrd]
 
 Many thanks to everyone who's contributed to the project.
 
@@ -235,3 +236,4 @@ You can also contact [@_tomchristie][twitter] directly on twitter.
 [wronglink]: https://github.com/wronglink
 [swistakm]: https://github.com/swistakm
 [z4r]: https://github.com/z4r
+[fernandogrd]: https://github.com/fernandogrd