v2.0.0

To upgrade to this major release run flutter pub upgrade objectbox --major-versions
(or for Dart Native apps dart pub upgrade objectbox --major-versions).

• Breaking changes to generated code: run flutter pub run build_runner build
  (or dart run build_runner build for Dart Native apps) after updating!
• Added and updated async APIs in Box:
  • new getAsync, getManyAsync, getAllAsync,
  • new putAsync and putManyAsync which support objects with relations,
  • renamed the former putAsync to putQueuedAwaitResult,
  • new putAndGetAsync and putAndGetManyAsync which return a copy of the given objects with new
    IDs set.
  • new removeAsync, removeManyAsync and removeAllAsync.
• Add new async Query APIs: findAsync, findFirstAsync, findUniqueAsync, findIdsAsync and
  removeAsync.
• Support sending objects containing ToOne and ToMany across isolates, e.g. when using
  store.runInTransactionAsync. #340
• Store.attach (and Store.fromReference) do not longer accept a null model, which was not
  supported anyhow.
• Breaking change: renamed store.awaitAsyncSubmitted and awaitAsyncCompletion to
  awaitQueueSubmitted and awaitQueueCompletion to avoid any mix-up with the new async methods.
• Removed deprecated Store.runIsolated.
• Require at least Dart SDK 2.15 (shipped with Flutter 2.8.0).

In this release objectbox_flutter_libs ships with objectbox-android 3.5.1 and ObjectBox pod 1.8.1.