Ruby 2.5.3 support

[morgoth]

Today 2 releases of Ruby 2.5.x were released, so looks like #77 is not enough to have 2.5.3 https://www.ruby-lang.org/en/news/2018/10/18/ruby-2-5-3-released/

[Stratus3D]

Closing, please follow rbenv/ruby-build#1240. Once ruby-build has added the version we can bump the version of ruby-build that asdf-ruby uses.

[mlitwiniuk]

This should be re-opened because of rbenv/ruby-build#1241

[Stratus3D]

I don't see a new version of ruby-build tagged yet.

[morgoth]

@Stratus3D is it about this release https://github.com/rbenv/ruby-build/releases/tag/v20181019 ?

[filipeamoreira]

As @morgoth mentioned, there is a new release of ruby-build (v20181019) which includes support for ruby 2.5.3. I will create a PR for it.

I see this has been merged already on b94f282. My bad.

[4ndv]

For those who like me does asdf list-all ruby and cannot find 2.5.3:

asdf update
asdf plugin-update ruby
asdf list-all ruby