doc: adding sebdeckers to collaborators

doc: adding sebdeckers to collaborators · nodejs/node@713f239

Original file line number	Diff line number	Diff line change
`@@ -469,6 +469,8 @@ For more information about the governance of the Node.js project, see`
`469`	`469`	`Sam Roberts <vieuxtech@gmail.com>`
`470`	`470`	`* [santigimeno](https://github.com/santigimeno) -`
`471`	`471`	`Santiago Gimeno <santiago.gimeno@gmail.com>`
	`472`	`+* [sebdeckers](https://github.com/sebdeckers) -`
	`473`	`+Sebastiaan Deckers <sebdeckers83@gmail.com>`
`472`	`474`	`* [seishun](https://github.com/seishun) -`
`473`	`475`	`Nikolai Vavilov <vvnicholas@gmail.com>`
`474`	`476`	`* [shigeki](https://github.com/shigeki) -`