require-description-complete-sentence crashes if line contains mismatched parentheses

[cscott]

Invalid regular expression: /underlying objects) and "stack" (a stack trace, if any)$/: Unmatched ')'
SyntaxError: Invalid regular expression: /underlying objects) and "stack" (a stack trace, if any)$/: Unmatched ')'
    at new RegExp (native)
    at Object.fix (/home/cananian/Projects/Wikimedia/Parsoid/node_modules/eslint-plugin-jsdoc/dist/rules/requireDescriptionCompleteSentence.js:78:29)

The culprit is this code:

      if (!/[.:?!]$/.test(paragraph)) {
        var line = _lodash2.default.last(paragraph.split('\n'));

        text = text.replace(new RegExp(line + '$', 'm'), line + '.');
      }