[Paraview] Required CMake version 3.5

[Christoph Grüninger]

Dear Paraview developers,
congratulations to the 5.1 release and thanks for your hard work!

I currently try to package it for openSuse and I stumbled upon the
required CMake version. What's the reason for this harsh requirement?
Wouldn't be 3.0 or similar be sufficient?
Currently all stable releases are excluded. I hope you can reduce the
required version for 5.1.1.

Bye
Christoph