v0.4.7

• Bug fixes
  • Fix hang when unloading the NIF. This bug caused :init.stop to never
    return and anything else that would try to unload this module.
  • Fix C compiler warnings with OTP 24

The minimum Elixir version has been changed from 1.4 to 1.6. Elixir 1.4 might
still work, but it's no longer being verified on CI.