Request new Ruby release

[ghost]

Please release new Cygwin Ruby. Current version is 2.3.6 (Dec 2017), and since
then 2 versions have dropped [1]:

• 2.4.3 (Dec 2017)
• 2.5.0 (Dec 2017)

2.4.0 introduced Enumerable#sum [2], and changes to class [3]

[1] http://github.com/ruby/ruby/tags
[2] http://stackoverflow.com/a/41235616
[3] http://stackoverflow.com/a/21411269

[yselkowitz]

At this point I plan to jump to 2.5.1 sometime after it is out.