removing toumorokoshi from approvers (open-telemetry#404)

Author: toumorokoshi

README.md

@@ -82,7 +82,6 @@ Approvers ([@open-telemetry/python-approvers](https://github.com/orgs/open-telem
 - [Diego Hurtado](https://github.com/ocelotl)
 - [Hector Hernandez](https://github.com/hectorhdzg), Microsoft
 - [Owais Lone](https://github.com/owais), Splunk
-- [Yusuke Tsutsumi](https://github.com/toumorokoshi), Google
 
 *Find more about the approver role in [community repository](https://github.com/open-telemetry/community/blob/main/community-membership.md#approver).*