Updated usage

[Yankie]

For those who's trying to go futher, here's updates to comply with current version replacements.mjs of markdown-it

  let markdownIt = require('markdown-it')({typographer: true});
  let markdownItReplaceIt = require('markdown-it-replace-it');
  
  markdownItReplaceIt.replacements.splice(0, markdownItReplaceIt.replacements.length);
  markdownItReplaceIt.replacements.push(
    {
        // +- → ±
        name: 'plusminus',
        re: /\+-/g,
        sub: '\u00b1',
        default: true
    },
    {
        // ... → … (also ?.... → ?.., !.... → !..)
        // ???????? → ???, !!!!! → !!!, `,,` → `,`
        name: 'punct',
        re: /(?:\.\.|\?\?\?\?|!!!!|,,).+/,
        sub: function (s) {
          var res = s
            .replace(/\.{2,}/g, '…')
            .replace(/([?!])…/g, '$1..')
            .replace(/([?!]){4,}/g, '$1$1$1')
            .replace(/,{2,}/g, ',');
            return res
        },
        default: true
    },
    {
        // -- → –, --- → —
        name: 'dash',
        re: /--.+/,
        sub: function (s) {
          var res = s
            .replace(/(^|[^-])---(?=[^-]|$)/mg, '$1\u2014')
            .replace(/(^|\s)--(?=\s|$)/mg, '$1\u2013')
            .replace(/(^|[^-\s])--(?=[^-\s]|$)/mg, '$1\u2013');
          return res
        },
        default: true
    },
  );

  markdownIt.use(markdownItReplaceIt);