mention captchas and ip blocking on dissecting a website

content/web_scraping/dissecting_websites.ipynb

@@ -68,6 +68,7 @@
     "1. Does the site require a user to log in?\n",
     "1. Is the site using sessions/cookies to manage client connections?\n",
     "1. Is the target data in the source HTML or is it dynamically generated by Javascript after the page has loaded in the browser? (*see [Website Personalities](website_personalities.ipynb) and [Driver the Browser, Robot](drive_the_browser_robot.ipynb)*)\n",
+    "1. Are there CAPTCHAs or does the site block IP addresses that issue too many requests? *Note: Often you'll only discover these roadblocks while testing or running a scraping. see [Website Personalities](website_personalities.ipynb) for more background.*\n",
     "\n",
     "[pagination]: https://en.wikipedia.org/wiki/Pagination#Pagination_on_UI"
    ]