Update _config.yml

Author: ratulm

_config.yml

@@ -24,6 +24,7 @@ authors:
       site:           https://ratul.org/
       avatar:         /assets/images/ratul-mahajan.jpg
       bio:            "Ratul Mahajan is an Associate Professor at the University of Washington (Paul G. Allen School of Computer Science) and a Co-founder and CEO of Intentionet, a company that is enabling safe, rapid evolution of computer networks using formal analysis and high-level design approaches. Prior to that, he was a Principal Researcher at Microsoft Research. He got his PhD at the University of Washington and B.Tech at Indian Institute of Technology, Delhi, both in Computer Science and Engineering."
+      twitter:        ratulm
 
     beckett:
       name:           Ryan Beckett