Change randomness behaviour to be like it was prior to go1.20 #16
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Pre go1.20, rand.Seed needed to be called for randomness. Meaning, that math/rand delivered deterministic values by default. This was changed however. To restore the old behaviour, we need to manually seed our random generator with a constant.
Additionally, this introduce a local instance of rand.Rand, in order to prevent unexpected behaviour with other code that relies on the global math/rand package.
Fixes #10 (The readme and docs explain this, therefore I consider this solved, as it is by design and not a bug)
Fixes #15