Revert "Exclude Rails 4.2 + ruby-head build (#1825)" #1851
Merged
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Follow up of #1825 (comment).
And this reverts commit c48cf46.
Summary
This PR restores Rails 4.2 + ruby-head (2.6) build.
Ruby 2.6.0 has been released.
https://www.ruby-lang.org/en/news/2018/12/25/ruby-2-6-0-released/
BigDecimal.new
has been replaced with deprecation rather than deletion.