[Slackbuilds-users] Small correction in README for paraview

[Fellype do Nascimento]

Hi admins,

Please, add a small correction to this line of the paraview README file:

PYTHONQT=yes -> PYTHONQT=yes (requires PythonQt)

Since passing PYTHONQT=yes to the build script will work only if 
PythonQt is installed. It will also avoid users to confuse PythonQt with 
PyQt (like this guy that is reporting it :-p )

Regards,

Fellype