afterUpdate missing args parameter/too many args passed to layout.prepare()

[mloit]

While poking around to familiarize myself with the code, I spotted the code below in plugin.js

  afterUpdate: function(chart, options) {
    chart[EXPANDO_KEY]._labels = layout.prepare(
      chart[EXPANDO_KEY]._datasets,
      options);
  },

Based on the plugin API documentation, options should be the 3rd parameter, following the 'args' parameter. Luckily this seems to be harmless as layout.prepare() is only expecting the datasets parameter, so the erroneous one is ignored. 'options' should be removed entirely from the code here.

[simonbrunel]

Thanks @mloit for reporting this issue. @LeeLenaleee fixed it in #268, which is merged in master.