Simplify logic for is_ace and is_face_card in deck of cards solution (#113)

solutions/object_oriented_design/deck_of_cards/deck_of_cards.ipynb

@@ -89,11 +89,11 @@
     "        super(BlackJackCard, self).__init__(value, suit)\n",
     "\n",
     "    def is_ace(self):\n",
-    "        return True if self._value == 1 else False\n",
+    "        return self._value == 1\n",
     "\n",
     "    def is_face_card(self):\n",
     "        \"\"\"Jack = 11, Queen = 12, King = 13\"\"\"\n",
-    "        return True if 10 < self._value <= 13 else False\n",
+    "        return 10 < self._value <= 13\n",
     "\n",
     "    @property\n",
     "    def value(self):\n",