protobuf-1.0.1

This releases bundles together a bunch of changes since 1.0.1:

1.1.0

• Require at least Dart SDK 2.7.0 to enable usage of extension methods.
• Introduce extension methods GeneratedMessage.rebuild and
  GeneratedMessage.deepCopy replacing copyWith and clone. Using these
  alternatives can result in smaller binaries, because it is defined once
  instead of once per class. Use protoc_plugin from 19.1.0 to generate
  deprecation warnings for copyWith and clone methods.
• GeneratedMessage.getExtension throws when reading trying to read an
  extension that is present in the unknown fields.
  We consider this change a bug-fix because depending on the old behavior is
  indicative of a bug in your program.

1.0.4

• Requires sdk 2.3.0
• Update pedantic to 1.9.2

1.0.3

• Enable hashCode memoization for frozen protos.
• Add timeout to ClientContext

1.0.2

• Fix hashcode of bytes fields.
• Fix issue with the permissiveEnums option to mergeFromProto3Json.
  The comparison did not work properly.
• Fix binary representation of negative int32 values.