Adopted some of the changes in PR #23 for categoricals

Author: WeatherGod

AnatomyOfMatplotlib-Part4-Limits_Legends_and_Layouts.ipynb

@@ -315,9 +315,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "A commonly-asked question is \"How do I plot non-numerical categories?\"\n",
-    "    \n",
-    "Currently, the most reliable way to do this is to \"fake\" the x-values and then change the tick labels to reflect the category. There are some new approaches that work in newer versions of mpl, but the developers are still working out the details of how it should work. In the meantime, \"faking\" the values is the most reliable.\n",
+    "A commonly-asked question is \"How do I plot categories?\"\n",
+    "\n",
+    "Starting in version 2.0 of mpl, just like any other data.\n",
     "\n",
     "For example:"
    ]
@@ -334,9 +334,7 @@
     "fruit, value = zip(*data)\n",
     "\n",
     "fig, ax = plt.subplots()\n",
-    "x = np.arange(len(fruit))\n",
-    "ax.bar(x, value, align='center', color='gray')\n",
-    "ax.set(xticks=x, xticklabels=fruit)\n",
+    "ax.bar(fruit, value, align='center', color='gray')\n",
     "plt.show()"
    ]
   },