Run clippy in CI

Author: LingMan

.github/workflows/main.yml

@@ -57,14 +57,16 @@ jobs:
 
 
   lints:
-    name: Rustfmt
+    name: Rustfmt & Clippy
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@stable
         with:
-          components: rustfmt
+          components: rustfmt, clippy
       - name: Check formatting
         run: cargo fmt --check
+      - name: Check clippy
+        run: cargo clippy -- -D warnings