Update README.md

Author: FZGbzuw412

README.md

@@ -17,7 +17,7 @@ Windows systems
 + pywin32
 + opencv-python
 + comtypes 
-+ pycaw (C++ [Buils tools](https://visualstudio.microsoft.com/ru/visual-cpp-build-tools/) are required)
++ pycaw ([C++ Buils tools](https://visualstudio.microsoft.com/ru/visual-cpp-build-tools/) are required) (optional feature)
 + pyautogui
 + vidstream ([VS Code](https://code.visualstudio.com/) is required) (optional feature)