Update code coverage action (#360)

.github/workflows/rust.yml

@@ -60,15 +60,19 @@ jobs:
       - uses: actions/checkout@v2
       - name: Install rustup
         run: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile=minimal
-      - name: Install nightly rust
+      - name: Install rust
         run: |
-          rustup install nightly
-          rustup default nightly
-      - name: Install cargo tarpaulin
-        run: RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install --force cargo-tarpaulin
-      - name: Run cargo tarpaulin
-        # TODO: Hook this up to coveralls, so we actually get coverage reports.
-        run: cargo tarpaulin --features all --verbose # --ciserver travis-ci --coveralls "$TRAVIS_JOB_ID";
+          rustup install stable
+          rustup default stable
+      - name: Run cargo-tarpaulin
+        uses: actions-rs/[email protected]
+        with:
+          args: '--features all --ignore-tests --out Lcov'
+      - name: Upload to Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: './lcov.info'
 
   doc:
     runs-on: ubuntu-latest