Merge branch 'add-mayra-cabrera-to-codeowners' into 'master'

Add Mayra Cabrera to .gitlab/codeowners

See merge request gitlab-org/gitlab-ce!28131

.gitlab/CODEOWNERS.disabled

 # Backend Maintainers are the default for all ruby files
-*.rb @ashmckenzie @ayufan @dbalexandre @DouweM @dzaporozhets @godfat @grzesiek @mkozono @nick.thomas @rspeicher @rymai @smcgivern
-*.rake @ashmckenzie @ayufan @dbalexandre @DouweM @dzaporozhets @godfat @grzesiek @mkozono @nick.thomas @rspeicher @rymai @smcgivern
+*.rb @ashmckenzie @ayufan @dbalexandre @DouweM @dzaporozhets @godfat @grzesiek @mkozono @nick.thomas @rspeicher @rymai @smcgivern @mayra-cabrera
+*.rake @ashmckenzie @ayufan @dbalexandre @DouweM @dzaporozhets @godfat @grzesiek @mkozono @nick.thomas @rspeicher @rymai @smcgivern @mayra-cabrera
 # Technical writing team are the default reviewers for everything in `doc/`
 /doc/ @axil @marcia