Add ruby-version as a comment
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@ -1,6 +1,7 @@
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#!/usr/bin/env ruby
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#!/usr/bin/env ruby
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class Hash
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class Hash
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# transform_keys was added in ruby-2.5
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def transform_keys
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def transform_keys
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map do |k, v|
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map do |k, v|
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[yield(k), v]
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[yield(k), v]
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