Adding diffutils to conda-forge

[davelopez]

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml"
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[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 (recipes/diffutils) and found it was in an excellent condition.

[bgruening]

Fine with me.

[bgruening]

@beatrizserrano do you agree to be a maintainer of this recipe?

[beatrizserrano]

sure :)

[bgruening]

Awesome! Thanks a lot for your first contribution.
When I merge this now, the package will be available in latest an hour.

Thanks again!
Bjoern