update instruction for Mac

Author: tame0001

module3/lab3/Lab3-skeleton.ipynb

@@ -54,6 +54,8 @@
    "source": [
     "# Install sqlalchemy. You only need to run this once.\n",
     "%pip install sqlalchemy==2.0.*\n",
+    "# If you are using Mac, comment the line above and uncomment the line below\n",
+    "# %pip install \"sqlalchemy==2.0.*\"\n",
     "# Automatically reload modules that have changed while running the notebook\n",
     "%load_ext autoreload\n",
     "%autoreload 2"