rename master to main and adjust ci.yml

.github/workflows/ci.yml

@@ -2,8 +2,9 @@ name: Rust
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
+    branches: [ main ]
   schedule: [ cron: "30 6 1 * *" ]
 
 env:
@@ -15,9 +16,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Check
       run: cargo check --all-features
+    - name: Clippy
+      run: cargo clippy --all-features
+    - name: Fmt
+      run: cargo fmt --check --quiet
     - name: Build
       run: cargo build --no-default-features --verbose
     - name: Run tests