Update python version

Author: savvan0h

jupyterhub/notebooks/get_statements_from_openlrw.ipynb

@@ -418,7 +418,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.3"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,