hardhat 0.1.5

• use_modeling_files() (and therefore, create_modeling_package()) now
  ensures that all generated functions are templated on the model name. This
  makes it easier to add multiple models to the same package (#152).

• All preprocessors can now mold() and forge() predictors to one of three
  output formats (either tibble, matrix, or dgCMatrix sparse matrix) via the
  composition argument of a blueprint (#100, #150).