v0.3.0

Version 0.3.0

Changes

• breaking Updates mix.exs with new dependencies, closes #14
• breaking Drops elixir version 1.2 and otp version 17 support

Improvements

• Updates cast/4 functions to cast/3 functions (new Ecto)
• Updates credo version and .credo.exs config
• Updates .travis.yml with credo and new otp release

Bugs

• Fixes dialyxer issues, closes #10

Documentation

• Updates docs, fixes spelling