Does not work with unicode

[Lightgazer]

An example of a failed test

    test('unicode tag', () => {
      const data = '<каталог></каталог>'
      const expected: PartialMatch[] = [
        {
          attributeNestingLevel: 0,
          opening: { name: 'каталог', start: 0, end: 9 },
          closing: { name: 'каталог', start: 9, end: 19 }
        }
      ]
      assert.deepEqual(parseTags(data, defaultEmptyElements), expected)
    })