Log Message:
ruby-jirametrics: update to 2.5. Changes:

* Better error messages in the case where
  `settings['customfield_parent_links']` does not point to the
  correct field.
* Fixed exceptions when loading a scrum board that has no sprints.
* Added `no_earlier_than` option in `download` block. This is helpful
  when there were some big changes in the way we worked and we want to
  ignore all data before a specific date. This can be used together with
  `rolling_date_count` or by itself.
* `standard_project` now accepts `rolling_date_count` and
  `no_earlier_than` options.
* `expedited_priority_names` has been deprecated on the board block. Now
  set it through `settings['expedited_priority_names']`
* Provided more reasonable defaults for `DependencyChart`. Everything is
  still configurable if you don't like the defaults.
  * Less noisy in terms of console output.
  * Now excludes any link where both ends are already closed.
  * Now excludes `cloned by` that everyone was manually excluding anyway.
  * Now properly uses the calculated `done` rather than looking at status category.
  * `standard_project` and `aggregated_projects` now build on the new defaults.
* More reasonable defaults in settings. As above, these can be
  overridden if you don't like the defaults.
  * `"blocked_link_text"` now defaults to `["is blocked by"]`
  * `expedited_priority_names` now defaults to `['Critical', 'Highest']`