Log Message:
devel/ruby-redmine_lightbox2: update to 0.5.1

Update ruby-redmine_lightbox2 to 0.5.1.

pkgsrc change:
* A few clean up.

0.5.1 (for Redmine 4.x) (2019-11-02)

Features

* major upgrade to fancybox library (from 2.1.5 to 3.5.7), introducing a
  new, modern lightbox theme
* Added support for image and pdf lightbox preview in 'Files' module (#72)

DMSF plugin support

* support for image previews in DMSF browser (#64)
* use file description as title instead of file name (#53)
* add DMSF file ID to lightbox title (#73)
* bugfix: checked wrong classname for imagelinks

Bugfixes

* general bugfixes
* issues view: show consistent titles/captions
* javascript bugfix for IE11 (#66)
* fix wrong title of magnifier icon
* reset auto image-orientation for Firefox and Safari (#67)

0.5.0 (for Redmine 4.0) (2019-01-08)

* Added Support for Redmine 4.0 and Rails 5.2

Milestone: https://github.com/paginagmbh/redmine_lightbox2/milestone/4?closed=1