Ensure pylibwholegraph conda packages have the license (#215)

Just adds the existing license to the `pylibwholegraph` conda recipe.

Authors:
  - Ray Douglass (https://github.com/raydouglass)

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #215

conda/recipes/pylibwholegraph/meta.yaml

@@ -75,4 +75,6 @@ requirements:
 
 about:
   home: https://rapids.ai/
+  license: Apache-2.0
+  license_file: ../../../LICENSE
   summary: pylibwholegraph library