Based on: https://github.com/Yonle/bostr/pull/8

Idea is originally by Takuro Furoda <https://github.com/ftkro>

This feature will only allow transmitting events from specified authors.

Suggested-by: Takuro Furoda

Signed-off-by: Yonle

https://github.com/Yonle/bostr/commit/6044eb2dba7ec6ba2a01328a85bbe5008d408c0f