escaping backslashes in neo4j publisher (#191)

* escaping backslashes in neo4j publisher

* removing an extra backslash

* Bumping versions to 1.5.3

databuilder/publisher/neo4j_csv_publisher.py

@@ -381,6 +381,8 @@ ON MATCH SET {update_prop_body}""".format(create_prop_body=create_prop_body,
             # escape quote for Cypher query
             # if isinstance(str, v):
             v = v.replace('\'', "\\'")
+            # escape backslash for Cypher query
+            v = v.replace("\\", "\\")
 
             if k.endswith(UNQUOTED_SUFFIX):
                 k = k[:-len(UNQUOTED_SUFFIX)]