Minor update to course notes and Session 4

Course Notes/Python Course Notes.ipynb

@@ -1939,8 +1939,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Subplots\n",
-    "In order for subplots to be used, it is necessary to access the underlying objects that control ...."
+    "### Subplots\n"
    ]
   },
   {
@@ -2015,7 +2014,7 @@
  "metadata": {
   "hide_input": false,
   "kernelspec": {
-   "display_name": "Python [default]",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -2029,7 +2028,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.6"
+   "version": "3.7.1"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,