Remove codecov (#8)

Author: Ryan Wholey

.github/workflows/test.yml

@@ -34,7 +34,4 @@ jobs:
           go-version: 1.17
 
       - name: Test
-        run: go test -race -v -coverprofile=coverage.txt -covermode=atomic ./...
-
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v2
+        run: go test -race -v ./...