Fix Colab links + install dependencies first.

Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

notebooks/03-pipelines.ipynb

@@ -51,6 +51,20 @@
     "```"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "outputs": [],
+   "source": [
+    "!pip install transformers"
+   ],
+   "metadata": {
+    "collapsed": false,
+    "pycharm": {
+     "name": "#%% code\n"
+    }
+   }
+  },
   {
    "cell_type": "code",
    "execution_count": 29,