Add Vadim's badge in authors.yml

Author: vmarkovtsev

data/authors.yml

@@ -41,7 +41,7 @@ eiso:
 vadim:
   name: Vadim Markovtsev
   thumbnail: https://avatars0.githubusercontent.com/u/2793551?v=3&s=460
-  bio: "A former system programmer, Vadim is now a machine learning engineer in love with deep neural networks."
+  bio: "A former system programmer, Vadim is now a machine learning engineer in love with deep neural networks. He is also a Google Developer Expert in Machine Learning."
   social:
     github: vmarkovtsev
     twitter: tmarkhor