Add security notice to Follower Factory notebook

Author: rhiever

follower-factory/Twitter Follower Factory.ipynb

@@ -49,6 +49,12 @@
  "\n",
  "Once the script finishes, it will save an image to the directory that you ran the script in. That image will contain the scatter plot visualization for the account you targeted.\n",
  "\n",
+ "## Security concerns\n",
+ "\n",
+ "Although you should be fine with this notebook, you should beware of placing private API keys and security-related information into scripts like this one. If you're particularly paranoid about the security of your Twitter account, you are welcome to review the code below and all of the open source libraries that it relies upon.\n",
+ "\n",
+ "If it looks like anything fishy is going on with the API keys, please don't hesitate to [file an issue on this repository](https://github.com/rhiever/Data-Analysis-and-Machine-Learning-Projects/issues/new) and raise your concerns.\n",
+ "\n",
  "## Questions and Comments\n",
  "\n",
  "If you have any questions or comments, please [file an issue on this repository](https://github.com/rhiever/Data-Analysis-and-Machine-Learning-Projects/issues/new) and I'll get back to you as soon as I can. If you'd like to submit a pull request to improve this script in any way, please file an issue first to discuss your change(s). I'm generally open to accepting pull requests on this repository."