Merge branch 'update-unicode-display_width' into 'master'

Update unicode-display_width (Rubocop dependency)

See merge request gitlab-org/gitlab-exporter!105
2 jobs for master in 1 minute and 16 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #6245280
rspec

00:01:02

passed #6245281
rubocop

00:01:12