Remove myself as a required reviewer (#61)

Most PRs to this repo shouldn't specifically require my review as long as some codeowner takes a look. It's mostly the patching functionality that nobody else can currently review as effectively (although hopefully that too changes over time).

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

URL: #61

.github/CODEOWNERS

@@ -1 +1 @@
-* @vyasr @rapidsai/cudf-dask-codeowners
+* @rapidsai/cudf-dask-codeowners