Use default_rng() instead of GLOBAL_RNG on Julia >= 1.3
#878
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I noticed that StatsBase still uses
Random.GLOBAL_RNGas the default RNG. This PR changes it toRandom.default_rng()on Julia >= 1.3 (it was introduced in Julia 1.3) which is the new and documented API. On newer Julia versionsRandom.GLOBAL_RNGstill exists for backward compatibility but it has been observed thatRandom.GLOBAL_RNGcan lead to reduced performance.