[infer][PR] Fix the ppx_deriving issue URL
[infer][PR] Fix the ppx_deriving issue URL

Summary:
Pretty trivial, but important in case GitHub will stop redirecting.
Pull Request resolved: https://github.com/facebook/infer/pull/1177

Differential Revision: D18347364

Pulled By: jvillard

fbshipit-source-id: b4e632780

facebook/infer,jvillard/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer