add nginx changes to changelog
Strict-Transport-Security warning
Merge branch 'nginx-ssl-updates' into 'master'

Strict-Transport-Security warning

Warning about STS setting set at https://github.com/gitlabhq/gitlabhq/blob/master/app/controllers/application_controller.rb#L163-L167.

See merge request !245
Merge branch 'changelog-updates' of https://gitlab.com/bbodenmiller/omnibus-gitlab into bbodenmiller/omnibus-gitlab-changelog-updates
Merge branch 'bbodenmiller/omnibus-gitlab-changelog-updates'
Merge branch 'master' of github.com:gitlabhq/omnibus-gitlab
Revert "Added upgrade notice for ee packages to first upgrade to 7.3 is they are using RPM packages."

This reverts commit 7102c4b1f073a72993bc5fae897a45765346ea1e.