Allow to use a seeded random for word generation #12
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In some cases is useful to have a deterministic / reproducible sequence of random generated words, and with this PR we add a new constructor function:
NewBabblerWithRand
, so we can provide an initialized random generator, to generate the words.Also, since the non-global random generator in go is not thread-safe, a Mutex (a write one because the random objects gets updated when we request a number) is added to the call that returns a a string.
With this PR we do not break any existing API contract or functionality, and existing apps can keep having previous non deterministic.