This Gem can be used to automatically resolve merge conflicts in
db/schema.rb. To use it you still need to initialise the configuration,
which can be done by running:

    merge_db_schema-init --force

See https://gitlab.com/gitlab-org/release/framework/issues/42 for more
information.

Signed-off-by: Rémy Coutable <remy@rymai.me>

[ci skip]

All this does is convert the version sections into headers. The list
items shouldn't really be indented by two spaces, but it makes no
difference to the rendering and this way we retain authorship history
for the actual changes.

Related to https://gitlab.com/gitlab-org/release-tools/merge_requests/29