fix: github action coverage

Author: SSebo

.github/workflows/build-with-coverage.yml

@@ -34,7 +34,7 @@ jobs:
 
       - name: generate code coverage
         run: |
-          cargo +nightly tarpaulin --verbose --workspace --timeout 120 --out Xml
+          cargo +nightly tarpaulin --verbose --workspace --timeout 120 --out xml
       - name: upload to codecov.io
         uses: codecov/codecov-action@v2
         with: