add encoding='utf-8' to open csv file (issue 3)

Author: bbelderbos

days/04-06-collections/collections.ipynb

@@ -648,7 +648,7 @@
     "    \"\"\"Extracts all movies from csv and stores them in a dictionary\n",
     "       where keys are directors, and values is a list of movies (named tuples)\"\"\"\n",
     "    directors = defaultdict(list)\n",
-    "    with open(data) as f:\n",
+    "    with open(data, encoding='utf-8') as f:\n",
     "        for line in csv.DictReader(f):\n",
     "            try:\n",
     "                director = line['director_name']\n",