devel/hoe: update to 3.17.0

=== 3.17.0 / 2018-03-17

* 2 minor enhancements:

  * Added task check_key to see if your signing cert is expired or not.
  * Bump rdoc dependency to range from 4.x to 5.x.

* 1 bug fix:

  * Fixed ridocs rake task.

(taca)