fix: JARVIS import example

Author: timurbazhirov

other/material/import_material_from_jarvis_db_entry.ipynb

@@ -79,6 +79,8 @@
    "outputs": [],
    "source": [
     "import json\n",
+    "from express import ExPrESS\n",
+    "\n",
     "## Note: JVASP-670 is an entry for MoTe2\n",
     "jarvis_db_entry = json.dumps(json.loads(df[(df['jid']=='JVASP-670')].to_json(orient='records'))[0])\n",
     "\n",
@@ -103,7 +105,7 @@
    "cell_type": "markdown",
    "source": [
     "## Upload to Mat3ra.com\n",
-    "Finally, we can upload the material to Mat3ra.com using the REST API: follow the explanation in another example notebook [here](../../examples/material/create_material.ipynb)."
+    "Finally, we can upload the material to Mat3ra.com using the REST API: follow the explanation in another example notebook [here](../../examples/material/create_material.ipynb). One can replace the content of the `CONFIG` variable with the JSON data above."
    ],
    "metadata": {
     "collapsed": false