Update committers.rst
Description
The list of committers on GitLab has changed fairly recently so we should update the table to reflect this. Marked as WIP while Laurence finds out whether others who are less active still want to be committers; will update this MR with the necessary removals once we know.
Update 2019-09-18: Committers contacted and updates made as necessary. Un-WIPped.
Changes proposed in this merge request:
- Adding Adam, Santi, Jeremiah, Arber and Richard to the committers list.
Edited by Beth