Fix tests

Author: tomhamiltonstubber

.github/workflows/tests.yml

@@ -21,5 +21,5 @@ jobs:
       - name: Tests
         run: make test
 
-      - name: Codecov
-        run: make codecov
+      - name: Upload coverage to Codecov
+          run: bash <(curl -s https://codecov.io/bash)