Fix documentation of interface

Author: devmotion

README.md

@@ -67,7 +67,7 @@ Statistics.mean(dist::GaussianPrior) = ...
 #   `rand(rng, dist)` should be implemented
 # - otherwise only `rand!(rng, dist, sample)` is required
 Base.rand(rng::AbstractRNG, dist::GaussianPrior) = ...
-Base.rand!(rng::AbstractRNG, dist::GaussianPrior, sample) = ...
+Random.rand!(rng::AbstractRNG, dist::GaussianPrior, sample) = ...
 
 # specify the type of a sample from the distribution
 Base.eltype(::Type{<:GaussianPrior}) = ...