Release notes for 4.7.2

Author: Boy Baukema

docs/release_notes/4.7.2.md

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+# OpenConext EngineBlock v4.7.2 Release Notes #
+
+Push Metadata improvements.
+
+* Downgrade notice about multivalued attributes to info
+* [Remove `libxml_disable_entity_loader()` call #180](https://github.com/OpenConext/OpenConext-engineblock/issues/180)
+* [error while pushing metadata #212](https://github.com/OpenConext/OpenConext-engineblock/issues/212)
+* [Metadata Push: DisplayName missing #223](https://github.com/OpenConext/OpenConext-engineblock/issues/223)
+* Added metadata push test client on `/api/connections/test`.
+* PEP error display improvements.
+* Minor language improvements.