version 0.2.0:  getMutex and getMutexAB have three different approximations of the Poison-Binomial distribution function: a "RefinedNormal"" Approximation (Volkova, 1996), "Binomial"" with two parameters (Cam, 1960), and a "Shifted Binomial" with three parameters (Peköz, Shwartz, Christiansen, & Berlowitz, 2010). This last is the approximation by default for both functions. Moreover, some bugs have been fixed.