Including builtin invenio.json in .cfg (#55)

* unique items in schema

* uniqueItems

* package data

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = oarepo-model-builder
-version = 1.0.0.dev11
+version = 1.0.0.dev12
 description = An utility library that generates OARepo required data model files from a JSON specification file
 authors = Miroslav Bauer <[email protected]>, Miroslav Simek <[email protected]>
 readme = README.md
@@ -31,6 +31,9 @@ install_requires =
 devs =
     pytest>=7.1.2
 
+[options.package_data]
+* = *.json, *.rst, *.md
+
 [options.entry_points]
 console_scripts = 
     oarepo-compile-model = oarepo_model_builder.cli:run