Changing time step in `simulate`

[bleyerj]

Hi, first thank you for the very nice package! If I understand it correctly, Koopman.simulate simulates the learned model forward in time with the same time interval dt as the one which was used to fit the model, right ? If so, would it be possible to include an option to change the dt for this prediction. For instance, I would like to test the quality of the learning with a small number of snapshots over a given time interval and check against the solution on the intermediate time steps between 2 snapshots used for the training. Thanks!