Merge pull request #653 from cmu-delphi/krivard/departure-workflows

Update CODEOWNERS for Katie's departure

.github/CODEOWNERS

@@ -1,5 +1,5 @@
 # default owners for anything not listed below, such as README and CI workflows
-* @krivard @capnrefsmmat
+* @rzats @capnrefsmmat
 
 # covidcast R package and data generation
 /R-packages/covidcast/ @capnrefsmmat
@@ -14,9 +14,6 @@
 # covidcast Python package
 /Python-packages/covidcast-py/ @chinandrew @capnrefsmmat
 
-# notebooks
-/R-notebooks/  @krivard
-
 # documentation changes go live instantly on GitHub.io, and hence require their
 # own review
 /docs/  @capnrefsmmat