Replace HeaderDowncaser with Hash#transform_keys #1015
Merged
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VCR dropping support for Ruby 2.4 allows a VCR specific module, HeaderDowncaser, to be replaced by a Ruby standard library call Hash#transform_keys.
I didn't find any unit tests specific to the module but the support module was used throughout the RSpec test suite.
Reference
Ruby 2.5 introduced Hash#transform_keys
https://docs.ruby-lang.org/en/3.2/NEWS/NEWS-2_5_0.html
Close: #1012