minimax_probability: Minimax probability for a two-stage curtail trial
In kaneplusplus/curtail: One and Two Stage Curtailed Trial Design

This function returns the probability of requiring the maximum sample size (minimax probability) of all designs contained in a two-stage curtail trial object

1	minimax_probability(x)

`x`	a two-stage curtailed trial object

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trials <- two_stage_curtail_trial(p1_null = 0.8, p2_null=0.2, 
p1_alt = 0.8, p2_alt = 0.4, n_total=36, prob_early=0.2, alpha=0.05)
minimax_probability(trials)