3032925 Update to 1.42

Authored and Committed by pghmcfc 7 years ago
    Update to 1.42
    
    - New upstream release 1.42
      - The DateTime::Duration->add and ->subtract methods now accept
        DateTime::Duration objects; this used to work by accident but is now done
        intentionallay, with docs and tests (GH#50)
    
        
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