add news

news/283-schema-id

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+### Enhancements
+
+* Bump schema version to `1`. (#282 via #283)
+
+### Bug fixes
+
+* Use `$schema` to indicate which schema will validate the menuinst shortcut.
+  This means that menuinst shortcuts must now include a `$schema` key pointing to a URL containing the relevant menuinst JSON schema version. (#282 via #283)
+
+### Deprecations
+
+* `$id` key is no longer required in the schema, and is now deprecated. (#282 via #283)
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>