eliocamp/metamer: metamer 0.3.0

This version overhauls the code and syntax. It makes it pipe friendly and includes new arguments and changes some of the existing ones.

• The new stop_if argument replaces the old N argument. This allows for more flexible and complex stopping criteria than just the number of iterations. See ?stop_conditions for a list of implemented functions.

• The new keep argument replaces the old trim argument.

(see ?stop_conditions).