nior4r requires Ruby version >= 2.3

[rverchere]

Hi,

when using last commit, the build fails:

Fetching gem metadata from https://rubygems.org/...
Gem::InstallError: nio4r requires Ruby version >= 2.3.
An error occurred while installing nio4r (2.5.2), and Bundler cannot continue.
Make sure that `gem install nio4r -v '2.5.2'` succeeds before bundling.

When using old commit it's fine:

source:
    git:
      ref: c00ecd7
      uri: https://github.com/openshift/ruby-ex.git

[nidal2020]

Hello

Did you find a solution please

Regards

[pvalena]

@nidal2020 Could you try this PR?

https://github.com/sclorg/ruby-ex/pull/37