Update config.yml

Author: gkorland

.circleci/config.yml

@@ -14,4 +14,5 @@ jobs:
     steps:
       - checkout
       - run: go get -v -t -d ./...
-      - run: go test -v ./...
+      - run: go test -v ./... -race -coverprofile=coverage.txt -covermode=atomic
+      - run: bash <(curl -s https://codecov.io/bash) -t ${CODECOV_TOKEN}