Added codecov

Author: Spijkervet

.github/workflows/ci.yml

@@ -10,10 +10,9 @@ on:
     branches: [ master ]
 
 jobs:
-  build:
+  test:
 
     runs-on: ubuntu-latest
-
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python 3.9
@@ -33,3 +32,5 @@ jobs:
     - name: Test with pytest
       run: |
         pytest
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v2