remove coverage

.github/workflows/coverage.yaml

@@ -1,32 +0,0 @@
-on: [push]
-
-name: Code Coverage
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v1
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --all-features --no-fail-fast
-        env:
-          CARGO_INCREMENTAL: '0'
-          RUSTFLAGS: '-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Zno-landing-pads'
-      - name: Generate coverage report
-        id: coverage
-        uses: actions-rs/grcov@v0.1
-      - name: list all /tmp files
-        run: ls -la /tmp
-      - name: Copy generated report
-        run: cp ${{ steps.coverage.outputs.report }} ${{ github.workspace }}/lcov.info
-      - name: Upload coverage report
-        uses: codecov/codecov-action@v1.0.2
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          file: ./lcov.info