Update toy_notebook_fr.ipynb

module2/exo1/toy_notebook_fr.ipynb

 {
  "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "March 28, 2019"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -165,6 +158,7 @@
   }
  ],
  "metadata": {
+  "celltoolbar": "Hide code",
   "kernelspec": {
    "display_name": "Python 3",
    "language": "python",
@@ -180,7 +174,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.6.2"
   }
  },
  "nbformat": 4,