Minor typo in demo notebook

Author: Minyall

demos/quickstart_demo.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "source": [
     "# Squashy Quickstart Demo\n",
-    "This notebooks will give you the basic steps to for loading in some graph data, compressing it using Squashy and then demonstrate some ways of visualising the newly generated core graph.\n"
+    "This notebook will give you the basic steps to for loading in some graph data, compressing it using Squashy and then demonstrate some ways of visualising the newly generated core graph.\n"
    ],
    "metadata": {
     "collapsed": false