95abe3 Update to 1.21

Authored and Committed by pghmcfc 3 years ago
    Update to 1.21
    
    - New upstream release 1.21
      - Declare variables with our() to avoid warnings (GH#109, GH#171)
      - Empty mapping value at the end resolves to null (was becoming empty string)
        (GH#131, GH#170)
      - Output key in warning when duplicate key was found (GH#119, GH#169)
      - Allow reading and writing to IO::Handle (GH#157, GH#168)
    
        
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