Log Message:
devel/ruby-curses: update to 1.3.1

### 1.3.1 / 2019-04-21

Bug fixes:

* Check whether sizeof(WINDOW) is available to avoid build failures on macOS.
  Issue #48 reported by chdiza.

### 1.3.0 / 2019-04-16

New features:

* Add Curses::Form and Curses::Field.

Bug fixes:

* Fix TravisCI issues by amatsuda and znz.
* Fix typo in sample/menu.rb by binford2k.
* Ctrl-/ should return ^_ on Windows.
* Workaround for new Windows console.
  https://github.com/Bill-Gray/PDCurses/pull/108