Udate CI

.github/workflows/code-coverage.yml

@@ -10,6 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
       - name: Install libsqlite3-dev
         run: |
           sudo apt-get update
@@ -27,4 +31,4 @@ jobs:
         uses: actions/upload-artifact@v1
         with:
           name: code-coverage-report
-          path: cobertura.xml
+          path: cobertura.xml