Update rock3r.json (#57)

updated video URL (replaced the video)

config/authors/rock3r.json

@@ -3,5 +3,5 @@
   "bio": "🇮🇹  Android GDE since 2014, currently bashing on his keyboard really hard at @JetBrains. Claim to fame: you are reading this? I guess. Whatever.",
   "photoURL": "https://avatars.githubusercontent.com/rock3r",
   "githubURL": "https://github.com/rock3r",
-  "interviewVideoId": "gbMwtIJnhFA"
+  "interviewVideoId": "z-YrtWgogAM"
 }