Add cargo fmt to github-actions config

Author: Atul9

.github/workflows/rust.yml

@@ -9,6 +9,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: Run Rustfmt
+      run: cargo fmt -- --check
     - name: Build
       run: cargo build --verbose
     - name: Run tests