Update swift.yml (#4)

Author: saroar

.github/workflows/swift.yml

@@ -12,8 +12,6 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Build
-      run: swift build -v
-    - name: Run tests
-      run: swift test -v
+    - uses: actions/checkout@v1
+    - name: GitHub Action for SwiftLint
+      uses: norio-nomura/action-swiftlint@3.2.1