clippy on CI

Author: termoshtt

.github/workflows/rust.yml

@@ -65,3 +65,11 @@ jobs:
       with:
         command: fmt
         args: -- --check
+
+  clippy:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions-rs/cargo@v1
+      with:
+        command: clippy