Commits on Jun 13, 2019

1. Scala 2.13.0 and Hash derivation rework …

   Case classes' `hashCode` is not backwards compatible in Scala 2.13,
   because it mixes the `productPrefix` for better distribution.
   This means we need version specific code to pass the `Hash` laws.
   
     * Update dependencies for Scala 2.13.0
     * Rework `Hash` derivation for consistency
     * Split product and coproduct derivation
     * Add a Scala version specific seed for `scala.Product` subtypes
     * Optimize `HashBuilder` to a one-pass hash
     * Replace usages of `Statics` (not recommended) with `MurmurHash3`
     * Test all variants of `Hash` derivation

   

   joroKr21 committed Jun 13, 2019
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