Enable bench (sekineh#29) (sekineh#30)

Will fix sekineh#29

Author: sekineh

.github/workflows/rust.yml

@@ -20,6 +20,10 @@ jobs:
         cargo_args:
         - ""
         - --features serde
+        include:
+          - os: ubuntu-latest
+            rust: nightly
+            cargo_args: ""
 
     runs-on: ${{ matrix.os }}
 
@@ -50,6 +54,13 @@ jobs:
         command: test
         args: ${{ matrix.cargo_args }}
 
+    - name: Run cargo bench
+      uses: actions-rs/cargo@v1
+      if: ${{ matrix.rust == 'nightly' }}
+      with:
+        command: bench
+        args: ${{ matrix.cargo_args }}
+
 #     - name: Build
 #       run: cargo build --verbose
 #     - name: Build (serde)