Issue title: cmake_minimum_required:   CMake 3.16 or higher is required.  You are running version 116.69.203.115
 Issue body: 
![Screenshot (8)](https://user-images.githubusercontent.com/73148531/98191186-ab4a0b80-1ee6-11eb-88c3-6874556a7669.png)


 Comments: 
 Comment 0: What should I do?

 Comment 1: Upate to a newer cmake version ofc.
 Comment 2: > What should I do?

I don't understand how you reading the instruction, I want to say that tdesktop building is not what you able to do at this point.
![image](https://user-images.githubusercontent.com/17829319/98258284-961dbd00-1f78-11eb-8b5a-15bcae2ef14d.png)

 Comment 3: This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
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