Added coveralls

.github/workflows/ci.yml

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+name: Tantivy CI
+
+on: [push]
+
+jobs:
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+      - run: rustup component add clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+

.github/workflows/coveralls.yml

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+on: [push]
+
+name: Code coverage with grcov
+
+jobs:
+  grcov:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+            #- macOS-latest
+            #- windows-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+          profile: minimal
+
+      - name: Execute tests
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all --lib
+        env:
+          CARGO_INCREMENTAL: 0
+          RUSTFLAGS: "-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=abort -Zpanic_abort_tests"
+
+      # Note that `actions-rs/grcov` Action can install `grcov` too,
+      # but can't use faster installation methods yet.
+      # As a temporary experiment `actions-rs/install` Action plugged in here.
+      # Consider **NOT** to copy that into your workflow,
+      # but use `actions-rs/grcov` only
+      - name: Pre-installing grcov
+        uses: actions-rs/install@v0.1
+        with:
+          crate: grcov
+          use-tool-cache: true
+
+      - name: Gather coverage data
+        id: coverage
+        uses: actions-rs/grcov@v0.1
+        with:
+          coveralls-token: ${{ secrets.COVERALLS_TOKEN }}
+
+      - name: Coveralls upload
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          parallel: true
+          path-to-lcov: ${{ steps.coverage.outputs.report }}
+
+  grcov_finalize:
+    runs-on: ubuntu-latest
+    needs: grcov
+    steps:
+      - name: Coveralls finalization
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          parallel-finished: true