flav-io/flavio v0.27.3

This minor release fixes a bug and brings a few minor improvements. A bug in the new physics contributions to B→lν decays was fixed. The methods get_central_all and get_random_all of ParameterConstraints have been accelerated. The mpmath package was dropped as a dependency since the complex dilogarithm, for which it was needed in the past, has been implemented in scipy and is 20 times faster. The minimum scipy version required is now 0.18. A new probability distribution LogNormalDistribution has been added. This is particularly useful for poorly known multiplicative factors in theory calculations. In YAML files, it can be specified with the notation 1 */ 3, corresponding to the exponential of a random variable normally distributed around ln(1) with mean and standard deviation ln(3) (the notation reminds of the fact that 68% probability is contained within 1*3 and 1/3)