Add interests of Ben

team.mkd

@@ -20,7 +20,7 @@ If you don't want to be a member of the team, make a PR to remove yourself.
 | Andreask Schwab       | @schwab             |                                                       |
 | Andrei Borzenkov      | @sand-witch         | parser, renamer, also want to do typechecker          |
 | Bartłomiej Cieślar    | @barci2             |                                                       |
-| Ben Gamari            | @bgamari            |                                                       |
+| Ben Gamari            | @bgamari            | RTS, Core optimisation, code generation, packaging    |
 | Bryan Richter         | @chreekat           | Contributor workflow, gitlab.haskell.org, CI          |
 | Cheng Shao            | @TerrorJack         |                                                       |
 | David                 | @knothed            |                                                       |