Make it identical to the solution

module3/exo1/influenza-like-illness-analysis.ipynb

@@ -39,12 +39,12 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In case the server is not available anymore, we use local copy of the data."
+    "In order to protect us in case the Réseau Sentinelles Web server disappears or is modified, we make a local copy of this dataset that we store together with our analysis. It is unnecessary and even risky to download the data at each execution, because in case of a malfunction we might be replacing our file by a corrupted version. Therefore we download the data only if no local copy exists."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": 30,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -52,7 +52,6 @@
     "\n",
     "import os\n",
     "import urllib.request\n",
-    "\n",
     "if not os.path.exists(data_file):\n",
     "    urllib.request.urlretrieve(data_url, data_file)"
    ]