Say in docstring of OptimizerMixin about stats_
Say in docstring of OptimizerMixin about stats_

victortxa/fatiando,mtb-za/fatiando,santis19/fatiando,drandykass/fatiando,fatiando/fatiando,rafaelmds/fatiando,cmeessen/fatiando,mtb-za/fatiando,fatiando/fatiando,cmeessen/fatiando,santis19/fatiando,rafaelmds/fatiando,drandykass/fatiando,victortxa/fatiando