Add user as a contributor

[Aman Raj]

Hi team,

Can someone please help giving contributor access to amanraj2520 username. I 
have raised a Spark Ticket : 
issues.apache.org/jira/browse/SPARK-44058<https://issues.apache.org/jira/browse/SPARK-44058>.
 I am not able to assign this to myself.

Thanks,
Aman.