Log Message:
databases/ruby-arel-helpers: update to 2.6.1

pkgsrc change:

* Update HOMEPAGE
* Add LICENSE
* Support multiple rails.

2.6.1

* Fix homepage URL in gemspec.

2.6.0

* Add the join alias helper.
* Add ability to pass table aliases to join_association.

2.5.0

* Add license information to gemspec so it is parsed by verifiers
  (@petergoldstein #31)
* Update QueryBuilder#reflect to create deep copy of builder (@wycleffsean
  #32)