Add Paraview conflict

[grlee77]

Paraview installs its internally bundled VTK python modules to the same path as this feedstock, creating a conflict.

I used the method described here to define a conflict.

Checklist

• [x] Used a fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [x] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [x] Ensured the license file is being packaged.

This came up in the course of investigating #83, which I think is an issue with the Paraview feedstock rather than this one.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.