Update How To Count Things.ipynb

ipynb/How To Count Things.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "<div align=right>Peter Norvig, Updated Sept 2018</div>\n",
+    "<div align=\"right\">Peter Norvig, Updated Sept 2018</div>\n",
     "\n",
     "![the count](https://vignette.wikia.nocookie.net/muppet/images/9/90/CountCountsLP%282%29.jpg/revision/latest/scale-to-width-down/280?cb=20140628202329)\n",
     "\n",