added grcov action

.github/workflows/rust.yml

@@ -82,3 +82,20 @@ jobs:
         with:
           command: clippy
           args: -- -D warnings
+
+  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'
+      - uses: actions-rs/grcov@v0.1