* [elm] Remove support for Elm 0.18
* [elm] Drop `Main.elm`
* [elm] Put all models in a single file
* [elm] Put generated code in `Api` package
* [elm] Introduce Request type for operations
* [elm] Generate list of enum variants
* [elm] Make default Time module
* [elm] Small improvements & fixes
* [elm] Improve support for allOf
* All of types are now nested;
* Adding a discriminator creates a custom type wrapping all variants
and a 'catch-all' fallback variant.
* [elm] Add support for recursive types
* [elm] Add catch-all type for allOf
* [elm] Drop support for post-processing of files
* [elm] Only import required packages
* [elm] Handle reserved and unsafe words
* [elm] Minor improvements
* [elm] Add support for integer enums
* [elm] Remove additional slash in path
* [elm] Add link to docs
* [elm] Update CI test file & scripts
