Adding 7digital.

Adding 7dgitial.

Contributor: Chris O'Dell, API Team Lead Developer at 7digital,
    @ChrisAnnODell
Source: internal headcount

7digital is 1 dev out of 21. If you add Ops there's 2 out of 27 and if
you add QA on top there's 4 out of 32.
Merge branch 'master' of github.com:ChrisAnn/women-in-software-eng