Add warning

Author: martinRenou

examples/Streaming.ipynb

@@ -7,6 +7,8 @@
    "source": [
     "# Streaming datagrid\n",
     "\n",
+    "**This is a new feature preview, if you see any issue with this. Please fill out an issue on Github!**\n",
+    "\n",
     "ipydatagrid provides the ability to lazily request data to the back-end. This requires a live kernel (does not work with a notebook exported to static HTML with nbconvert).\n",
     "\n",
     "This feature allows a **smaller memory footprint for the grid**, and **reduced loading time for the initial grid display.**"
@@ -35,8 +37,8 @@
     "dataframe = pd.DataFrame(np.random.randn(100, 100))\n",
     "\n",
     "streaming_datagrid = StreamingDataGrid(\n",
-    "    dataframe, \n",
-    "    default_renderer=default_renderer, \n",
+    "    dataframe,\n",
+    "    default_renderer=default_renderer,\n",
     "    debounce_delay=50\n",
     ")\n",
     "streaming_datagrid"