update rdfoo to fix module resolution issues

Author: jamesamcl

package.json

@@ -32,8 +32,8 @@
     "rdf-graph-array-sboljs": "^0.3.1",
     "rdf-parser-n3": "^0.3.0",
     "rdf-parser-rdfxml": "^0.3.1",
-    "rdfoo": "=0.18.0",
-    "rdfoo-prov": "=0.19.0",
+    "rdfoo": "=0.19.0",
+    "rdfoo-prov": "=0.20.0",
     "shortid": "^2.2.8",
     "uuid": "^3.3.2"
   },