Update to 1.57
    
    - New upstream release 1.57
      Incompatible change:
      - Previously, some errors would throw exceptions and some would return the
        error condition in $YAML::Tiny::errstr, but now all errors throw
        exceptions; use of $errstr and the errstr method are deprecated
      Fixed:
      - Fixed write method to encode YAML file with UTF-8
      - Improved SYNOPSIS and documentation of new
      Testing:
      - Tests have been cleaned up and reorganized
      - Test coverage has been significantly improved
    - Package docs CONTRIBUTING and README.md
    - Update dependencies as needed