2.3.0

This release incorporates some interesting new functionality:

• Allow using embedded schemas for structured translations. This is now the preferred way of using Trans
• Allow translating entire structs using the new translate/2 function
• Raise if a translation does not exist when using the new translate!/3 function
• Documentation imrovements

Additionally:

• Trans now requires Elixir 1.7 or higher
• Tests have been migrated from CircleCI to GitHub Actions
• Trans dependencies have been updated to avoid compilation warnings