Fix incorrect required_ruby_version #985
Merged
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This gem has used String#delete_suffix which was introduced at Ruby 2.5.
parser/lib/parser/lexer/literal.rb
Line 250 in 95d2695
Ref. https://github.com/ruby/ruby/blob/ruby_2_5/NEWS
So, even Ruby 2.0 can be installed now, however it will not work.