v8.0.0

Breaking changes:

• Migrate FFI to ES modules (#130 by @kl0tl and @JordanMartinez)

• Replaced polymorphic proxies with monomorphic Proxy (#132 by @JordanMartinez)

• Make frequency use NonEmptyArray (#131 by @JordanMartinez)

  Now oneOf and frequency both use NonEmptyArray rather than NonEmptyList.

Bugfixes:

• quickCheckPure and quickCheckPure' stack safety (#127)

Other improvements:

• Drop math dependency; update imports (#133 by @JordanMartinez)