Merge pull request #505 from zcash/ci-updates

CI updates

.github/workflows/ci.yml

@@ -8,9 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        # We don't need to test across multiple platforms yet
-        # os: [ubuntu-latest, windows-latest, macOS-latest]
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
       - uses: actions/checkout@v2
@@ -106,9 +104,7 @@ jobs:
           command: tarpaulin
           args: --all-features --timeout 600 --out Xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
-        with:
-          token: ${{secrets.CODECOV_TOKEN}}
+        uses: codecov/codecov-action@v2.1.0
 
   doc-links:
     name: Intra-doc links