Exclude builds for newer Rubies and old Rails versions
Exclude builds for newer Rubies and old Rails versions

 * Rails 4.2 supports versions between 1.9 and 2.4: https://github.com/rails/rails/blob/406e2f46/.travis.yml#L26-L31
 * Rails 5.0 supports versions between 2.2 and 2.4: https://github.com/rails/rails/blob/ecd965e7/.travis.yml#L46-L48

zorab47/active_admin-sortable_tree,zorab47/active_admin-sortable_tree,zorab47/activeadmin-sortable-tree,zorab47/active_admin-sortable_tree,zorab47/activeadmin-sortable-tree,zorab47/activeadmin-sortable-tree