Create a new release for #452

[ribose-jeffreylau]

@opoudjis We'd like to use the new feature provided by (the resolution to) #452. Please create a new metanorma release when you see fit. Thank you. Here is the change log:

changelog

• Added new output filename templating system:
  • Uses Liquid template engine for generating output filenames. All output artifacts will follow this template as the base name.
  • Output filename template can be specified via options[:output_filename_template]
  • Default template: {{ document.docidentifier | downcase | replace: '/' , '-' | replace: ' ' , '-' }}
  • Access Relaton metadata through document object:
    • document.docidentifier: Document identifier
    • document.title: Document title
    • document.date: Document date
    • document.language: Document language
    • document.script: Document script
    • document.version: Document version
    • document.publisher: Document publisher
  • Example templates:
    • With version: {{ document.docidentifier }}_{{ document.version }}
    • With language: {{ document.docidentifier | downcase }}_{{ document.language }}
    • With conditional: {% if document.doctype == 'international-standard' %}iso-{% endif %}{{ document.docnumber }}
• Aligned rubocop's Ruby version requirement with gemspec's, to 3.1