Loz Jackson

Update ember-cli to 5.8.1 and add ember-data peer dependencies

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This PR updates ember-cli to 5.8.1 and adds `@ember-data/adapter` and `@ember-data/serializer` to `peerDependencies` to make this library compatible with ember-data 5.3.8 Fixes #189

`errorsHashToArray` has been removed from ember-data in 5.x. This PR adds the method to this project so that it doesn't throw errors when trying to call it Fixes #191

When using this library with ember-data v5.x I'm seeing errors thrown because the `errorsHashToArray` function has been removed from ember-data

Error with ember-data 5.3.8: Could not find module `@ember-data/adapter/rest`

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Since upgrading ember-data I'm getting an error in the console > Error: Could not find module `@ember-data/adapter/rest` imported from `active-model-adapter/active-model-adapter` I guess something changed with ember-data in that version. I'm...