add other repository link

Author: Zuikyo

collected-symbol-files.md

@@ -1,7 +1,5 @@
 ## Download
 
-Since iOS 10, the system firmware is not encrypted, so you can just get those symbols by yourself. And I will not update the list any more. See [Extract Symbols from Firmware](./README.md#extract-symbols-from-firmware).
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 You can download the symbols you need here:
 
 [iOS system symbol files(7.0-9.2)](https://drive.google.com/drive/folders/0B-0LZDbSzubRaUdMdTJQc1ZzMUU?usp=sharing)
@@ -16,6 +14,14 @@ If you're in China, check here:
 
 Baidu Netdisk: [https://pan.baidu.com/s/1dknV17E80JZeMK8e8SY8Fw?pwd=r78c](https://pan.baidu.com/s/1dknV17E80JZeMK8e8SY8Fw?pwd=r78c) sharing code: `r78c`
 
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+Since iOS 10, the system firmware is not encrypted, so you can just get those symbols by yourself. And I will not update the list any more. See [Extract Symbols from Firmware](./README.md#extract-symbols-from-firmware).
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+There is another nice guy collecting symbols after iOS 13, see https://github.com/CXTretar/iOS-System-Symbols-Supplement
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 I take those `dyld_shared_cache_xxxx` files in `Symbols/System/Library/Caches/com.apple.dyld` out to reduce the size of the symbol files. They're not necessary for symbolicating. They're only needed when debugging with a real device. If you need them, download those `xxxx-Caches` files. Only `dyld_shared_cache_xxxx` from real device were kept, those from firmware or from Xcode are not included.
 
 ## Symbols list