Updating name in the contributers list

Summary: This diff aims to add my GitHub profile to the list of contributers.

Test Plan: NA

Reviewers: aagrawal

Reviewed By: aagrawal

Differential Revision: https://phabricator.dev.yugabyte.com/D16597

CONTRIBUTORS.md

@@ -148,3 +148,4 @@ This is a list of people who have contributed code to the [YugabyteDB](https://g
 * [def-](https://github.com/def-)
 * [hari90](https://github.com/hari90)
 * [tverona1](https://github.com/tverona1)
+* [vaibhav-yb](https://github.com/vaibhav-yb)