Incorrect use of call in Glossary.prototype.root

[shellscape]

As the module sits right now, the call to .root(__dirname, '..') will result in:

path.js:7
    throw new TypeError('Path must be a string. Received ' + inspect(path));
    ^

TypeError: Path must be a string. Received [ '<path>', '..' ]

The fix is:

Glossary.prototype.root = function () {
  const args = Array.prototype.slice.call(arguments);
  this._attrs.root = path.resolve.apply(path, args);
  return this;
};