Update to 1.25
    
    - New upstream release 1.25
      - Support trailing comments (GH#189, GH#190, GH#191)
      - Remove unused code (GH#192)
      - Use Test::Deep to actually test correctly for class names (GH#193)
      - Fix loading of mapping key that starts with '= ' (GH#194)
      - Fix loading strings with multiple spaces (GH#172)
      - Allow more characters in anchor name (GH#196)
      - Add $YAML::LoadBlessed for disabling loading objects (GH#197)
      - Disable test with long string under certain conditions (GH#201)
      - Quote scalar if it equals '=' (GH#202)
      - Multiple regexp roundtrip does not grow (GH#203)
      - Add support for compact nested block sequences (GH#204)
      - Support reverse order of block scalar indicators (GH#205)
      - Support nested mappings in sequences (GH#206)