v2.4.0: 'Elixir 1.6' + 'JSON schema draft 6'
Adds Elixir 1.6 support.
- Elixir 1.6 contains a breaking change when parsing URIs, which has been taken care of.
- json-schema-to-elm now support json-schema draft version 6.
- default module name changed to 'Data'.
- json-schema-to-elm now uses mix formatter.
- minor bug fixes.