Update code owners (facebookresearch#73)

Summary:
Pull Request resolved: facebookresearch#73

Removed folks left and updated to reflex current contributors.

Reviewed By: sunghlin

Differential Revision: D45999523

fbshipit-source-id: 5d302963c2c9d153fee927d17593875c9643d0c3

CODEOWNERS

@@ -3,4 +3,4 @@
 
 # These owners will be the default owners for everything in
 # the repo. Unless a later match takes precedence.
-*       @srinivas212 @naghshineh @kingchc @shz0116 @luo-liang @amirstar
+*       @srinivas212 @kingchc @louisfeng @sunghlin @wfu-fb @shengbao-zheng @briancoutinho