Ack 1.7.0-beta.3

1.7.0-beta.3

• Remove the ack_annotations package; the annotations ship in ack. Models
  import package:ack/ack.dart (@Schemable, @AckField, @Optional,
  @Required, @NotNull). Files that use constraint annotations or the
  deprecated spellings also import package:ack/annotations.dart, with a
  prefix (as ack) where a name clashes with another type. Format
  annotations move to package:ack/format_annotations.dart.
• @Schemable() is the single annotation for schema-first and class-first
  generation. @AckInfer() and @AckModel() are deprecated and will be
  removed in 2.0.0.
• Rename @Pattern to @Matches. The deprecated Pattern alias stays in
  package:ack/annotations.dart; an unprefixed import of that library hides
  dart:core's Pattern.
• ack no longer depends on json_annotation or re-exports JsonKey. A field
  renamed with @JsonKey(name: ...) imports JsonKey from
  package:json_annotation and the app depends on json_annotation.
  AckModel.jsonSerializable and AckGeneratedJson.config are removed.
• A class-first field whose type declares a static schema resolves to it with
  no annotation, including extension types, enums, and generic types through a
  static schema<A>() method that can receive each type argument's schema.
• The generator rejects input that used to produce wrong or non-compiling
  output: types the annotated library cannot name, mismatched or generic
  @AckField(schema:) functions, non-finite constraint values, @Schemable
  options for the other target, and JsonConverter annotations on class-first
  models.
• Align all five publishable packages at 1.7.0-beta.3. The generator requires
  ack 1.7.0-beta.3.