fix(CI): update clippy workflow (#64)

Author: Valerioageno

.github/workflows/main.yml

@@ -43,6 +43,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+          components: clippy
 
       - run: cargo clippy -- -D warnings