fix: raise if primary_key: true and no prefix (#22)

Better support for Ecto (#21)

* use schema associations to derive prefixes

* expand documention for ecto usage

* 0.5.0

`Jason.Encoder` impl (#18)

Common protocol implementations (#16)

* `String.Chars` impl

* `Phoenix.HTML.Safe` impl

* `Phoenix.Param` impl

Add Ecto support (#14)

* add ecto type support

* Ecto.ParameterizedType, `time: ...` for `new/2`

* 0.3.0

0.2.0

- follows 0.2.0 spec limiting leading suffix character to 0..7