Upload coverage report without token (#133)

See larq/zoo#146

Author: lgeiger

.github/workflows/unittest.yml

@@ -34,6 +34,4 @@ jobs:
         run: python examples/larq_experiment.py BinaryNetMnist epochs=0 --dataset.download
       - name: Upload code-coverage report to Codecov
         if: matrix.python-version == '3.7' && matrix.tf-version == '2.0.1'
-        run: curl -s https://codecov.io/bash | bash -s -- -t $token -f ./coverage.xml -F unittests
-        env:
-          token: ${{secrets.CODECOV_TOKEN}}
+        run: curl -s https://codecov.io/bash | bash -s -- -f ./coverage.xml -F unittests