codecov: Add default codecov.yaml file
codecov: Add default codecov.yaml file

This file is recommended by codecov.io (unchanged).

quilt/quilt,stevenlin598/quilt,PenguinToast/quilt,ejj/quilt-dev,kayousterhout/quilt,LuiseV/quilt,kayousterhout/quilt,mmussomele/quilt,kelda/kelda,LuiseV/quilt,ejj/quilt-dev,LuiseV/quilt,kklin/quilt,quilt/quilt,PenguinToast/quilt,mmussomele/quilt,NetSys/quilt,quilt/quilt,kklin/kelda,kklin/quilt,PenguinToast/quilt,stevenlin598/quilt,tejasmanohar/quilt,tejasmanohar/quilt,mmussomele/quilt,PenguinToast/quilt,tejasmanohar/quilt,LuiseV/quilt,kklin/quilt,kelda/kelda,NetSys/quilt,NetSys/quilt,ejj/quilt-dev,mmussomele/quilt,kklin/quilt,stevenlin598/quilt,kelda/kelda,stevenlin598/quilt,PenguinToast/quilt,NetSys/quilt,kklin/kelda,stevenlin598/quilt,kayousterhout/quilt,kklin/kelda,LuiseV/quilt,mmussomele/quilt,ejj/quilt-dev,tejasmanohar/quilt,kklin/kelda,kayousterhout/quilt,quilt/quilt,kelda/kelda,mmussomele/quilt,stevenlin598/quilt,NetSys/quilt