Add other contributors to the types owners header

[Maxim-Mazurok]

@namoscato and @declanvong should be listed in the types owners header as well.

Also, I will be happy to add @harpojaeger once he contributes to this project.

Let me know what you guys think and open PR to add yourself. Change should be made somewhere here:

google-api-typings-generator/src/app.ts

Lines 613 to 615 in 7eb46b0

	writer.writeLine(
	'// Definitions by: Maxim Mazurok <https://github.com/Maxim-Mazurok>'
	);

I appreciate your collaboration!