Log Message:
devel/ruby-pkg-config: update to 1.3.1

== 1.3.1 - 2018-04-28

=== Improvements

  * Changed search order to find C flags.
    [GitHub#6][Reported by HIGUCHI Daisuke]
    * Before: Requires -> Requires.private
    * After: Requires.private -> Requires

=== Thanks

  * HIGUCHI Daisuke

== 1.3.0 - 2018-04-10

=== Improvements

  * Added Ruby 2.0 on Ubuntu Trusty again.

== 1.3.0 - 2018-04-10

=== Improvements

  * Added Ruby 2.0 on Ubuntu Trusty again.