Require at least Ruby 2.4 #4
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In 497da58, you added a top-level return in case we are running on JRuby. This top-level return however is only supported since Ruby 2.4 (following https://bugs.ruby-lang.org/issues/4840)
Accordingly, trying to require the gem in Ruby 2.3 or earlier fails with the following error message:
This pull requests updates the declared minimum Ruby version to 2.4 so that the top-level return is guaranteed to be supported.