requested changes complete

Author: tarunkukreja003

samples/04_gis_analysts_data_scientists/visualize_monthly_changes_in_hirakund_reservoir_using_video.ipynb

@@ -1257,6 +1257,13 @@
     "!conda install -c anaconda pillow -y"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "if you have imageio installed you can skip running the next two cells"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 16,
@@ -1277,7 +1284,9 @@
   {
    "cell_type": "code",
    "execution_count": 17,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [
     {
      "name": "stdout",