Bump version of `analyzer`

• Bump version of analyzer, fix deprecation warnings.

Bump version of `analyzer`

• Bump version of analyzer.

Bug fix for constructor annotations

• Bug fix: allow constructors to have annotations. Previously, annotations
  would cause codegen to fail.

Fixes, improvements and @BuiltValueHook

New features:

• Add @BuiltValueHook annotation. It provides the same functionality as
  _initializeBuilder and _finalizeBuilder, but in a more visible way:
  annotate a static method on the value class with @BuiltValueHook to
  have it called on builder creation or finalization.
• Add back serializeNulls to BuiltValueSerializer annotation. By default
  generated serializers skip null fields instead of writing them; set
  serializeNulls to write the nulls.

New minor functionality:

• Support use of nulls in collections when the key or value types are
  explicitly nullable.
• Allow JsonObject to be instantiated from a Map<dynamic, dynamic>.
• Mark nested builder getters in instantiable: false classes not nullable,
  to match the implementations. Use autoCreateNestedBuilders: false to get
  the old behaviour.
• Allow explicit nulls in JSON for nullable fields when deserializing.
• Specify annotation targets; the analyzer will now hint if a built_value
  annotation is used where it has no effect.
• Support polymorphism with mixed in parent value type: generated builder
  now mixes in parent builder.

Bug fixes:

• Fix support for serializing and deserializing nulls.
• Fix nestedBuilders: false with instantiable: false.
• Fix enum deserialization fallback for int.
• Annotating a wrong type getter with @SerializersFor is now an error,
  instead of just generating nothing.

Cleanup:

• Removed Angular mixin from example, as this feature is no longer needed:
  Angular now directly supports using static members in templates.

Bump versions of build_config and build_runner.

v8.0.6

Bump packages. Release 8.0.6. (#1031)

Bump `analyzer` dependency

v8.0.5

Release 8.0.5. (#1026)

Bump `source_gen` dependency

v8.0.4

Release 8.0.4. (#1010)

Fix error message, bump `package:build`

• Fix error message for builder factory not installed.
• Bump version of build.

Bump analyzer, quiver versions

v8.0.2

Bump packages, release 8.0.2. (#1001)

Sound null safety fix, other fixes

8.0.1

• Update chat example to webdev.
• Allow nulls when serializing/deserializing for better JSON interop.
• Fix generation bugs around enum wire name and polymorphism.
• Fix generation with generics for analysis with strict-raw-types.
• Add test coverage around generation for generic serialization.
• Add test coverage around initialization with generics.

Note that you are unlikely to be able to use this version due to version issues; 8.0.2 will be released next for that.