mize 0.2.4

Bug fix release.

Bug fixes.

If using line_search = "backtracking" with a specified step_down parameter, an incorrectly large number of gradient calculations was being
reported.
The documentation now specifies that if you don't provide a step_down argument with line_search = "backtracking", interpolation using function and gradient evaluations is carried out. To get a typical Armijo-style backtracking line search, specify a value for step_down (e.g.
step_down = 0.5 to halve the step size), and only function evaluations are used.