Package integrity updates

packages/docregistry/package.json

@@ -36,6 +36,7 @@
     "@jupyterlab/coreutils": "^0.13.0",
     "@jupyterlab/observables": "^0.2.0",
     "@jupyterlab/rendermime": "^0.13.0",
+    "@jupyterlab/rendermime-interfaces": "^0.4.3",
     "@jupyterlab/services": "^0.52.0",
     "@phosphor/algorithm": "^1.1.2",
     "@phosphor/coreutils": "^1.3.0",