Fix some outdated differences in README

Author: helje5

README.md

@@ -121,12 +121,6 @@ ManagedModels has no other dependencies.
   [`NSManagedObject`](https://developer.apple.com/documentation/coredata/nsmanagedobject)
   (superclasses can't be added by macros), 
   e.g. `@Model class Person: NSManagedObject`.
-- ToMany relationships must be a `Set<Target>`, a plain `[ Target ]` cannot be
-  used (yet?). E.g. `var contacts : Set<Contact>`.
-- Properties cannot be initialized in the declaration,
-  e.g. this doesn't work: `var uuid = UUID()`. 
-  Must be done in an initializers (requirement by `@NSManaged`).
-- CoreData doesn't seem to support optional Swift base types like `Int?`.
 - Uses the CoreData `@FetchRequest` property wrapper instead `@Query`.
 - Doesn't use the new 
   [Observation](https://developer.apple.com/documentation/observation) 
@@ -137,13 +131,10 @@ ManagedModels has no other dependencies.
 
 #### TODO
 
-- [x] Archiving/Unarchiving, required for migration.
 - [ ] Figure out whether we can do ordered attributes: [Issue #1](https://github.com/Data-swift/ManagedModels/issues/1).
-- [x] Figure out whether we can add support for array toMany properties: [Issue #2](https://github.com/Data-swift/ManagedModels/issues/2)
 - [ ] Support for "autosave": [Issue #3](https://github.com/Data-swift/ManagedModels/issues/3)
 - [ ] Support transformable types, not sure they work right yet: [Issue #4](https://github.com/Data-swift/ManagedModels/issues/4)
 - [ ] Generate property initializers if the user didn't specify any inits: [Issue #5](https://github.com/Data-swift/ManagedModels/issues/5)
-- [x] Generate `fetchRequest()` class function.
 - [ ] Support SchemaMigrationPlan/MigrationStage: [Issue #6](https://github.com/Data-swift/ManagedModels/issues/6)
 - [ ] Write more tests.
 - [ ] Write DocC docs: [Issue #7](https://github.com/Data-swift/ManagedModels/issues/7), [Issue #8](https://github.com/Data-swift/ManagedModels/issues/8)
@@ -154,6 +145,9 @@ ManagedModels has no other dependencies.
   - [ ] SwiftUI `@Query` property wrapper/macro?: [Issue 12](https://github.com/Data-swift/ManagedModels/issues/12)
 - [ ] Figure out all the cloud sync options SwiftData has and whether CoreData
       can do them: [Issue 13](https://github.com/Data-swift/ManagedModels/issues/13)
+- [x] Archiving/Unarchiving, required for migration.
+- [x] Figure out whether we can add support for array toMany properties: [Issue #2](https://github.com/Data-swift/ManagedModels/issues/2)
+- [x] Generate `fetchRequest()` class function.
 - [x] Figure out whether we can allow initialized properties 
       (`var title = "No Title"`): [Issue 14](https://github.com/Data-swift/ManagedModels/issues/14)