contentful/contentful-persistence.swift breaking changes

• 0.5.0 \u2192 0.6.0breaking

  **BREAKING:** `mapping()` is now called `fieldMapping()` to clarify that only 'fields' from your Entries ContentModel must be mapped.

• 0.5.0 \u2192 0.6.0breaking

  **BREAKING:** `localeCode: String` is now a necessary property for `ContentSysPersistable` model classes.

• 0.12.1 \u2192 0.13.0breaking

  **BREAKING:** Another side-effect of the updated dependency on [contentful.swift](https://github.com/contentful/contentful.swift) is that the `localeCode` property on your `NSManagedObject` subclasses must now be marked as optional. Don't forget to check the "Optional" box in the assistant Xcode editor for your `@NSManaged` variable in the CoreData model editor.

• 0.12.1 \u2192 0.13.0breaking

  The project is now updated to Swift 4.2.

• 0.10.0 \u2192 0.11.0breaking

  **BREAKING:** Upgrades project to Xcode 9.3 and Swift 4.1

• 0.9.1 \u2192 0.10.0breaking

  You can now use the `fetchData(for:with:)` method from contentful.swift on `AssetPersistable` instances

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