Update README.md

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fawkes/README.md

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 * Download the binary following this [link](http://sandlab.cs.uchicago.edu/fawkes/files/fawkes_binary.zip) and unzip the download file. 
 * Create a directory and move all the images you wish to protect into that directory. Note the path to that directory (e.g. ~/Desktop/images). 
 * Open [terminal](https://support.apple.com/guide/terminal/open-or-quit-terminal-apd5265185d-f365-44cb-8b09-71a064a42125/mac) and change directory to fawkes (the unzipped folder). 
-* (If your MacOS is Catalina) Run `sudo spctl --master-disable` to enable running apps from unidentified developer. 
+* (If your MacOS is Catalina) Run `sudo spctl --master-disable` to enable running apps from unidentified developer. We are working on a solution to bypass this step. 
 * Run `./fawkes -d IMAGE_DIR_PATH -m low` to generate cloak for images in `IMAGE_DIR_PATH`. 
 * When the cloaked image is generated, it will output a `*_low_cloaked.png` image in `IMAGE_DIR_PATH`. The generation takes ~40 seconds per image depending on the hardware. 
 * More details on the optional parameters check out the [github repo](https://github.com/Shawn-Shan/fawkes/tree/master/).