inside-rust: announce four new team members

[davidtwco]

cc rust-lang/team#1608

Rendered

[lcnr]

4?

[wesleywiser]

cc @ChrisDenton, @m-ou-se, @rcvalle and @workingjubilee to make sure you like your sections 🙂

[m-ou-se]

I have a slight preference for using my name (Mara) instead of my username (m-ou-se), but otherwise looks good! Thanks <3

[workingjubilee]

Thank you!