Update build.yml

Author: ufcpp

.github/workflows/build.yml

@@ -47,7 +47,7 @@ jobs:
         VERSION="${VERSION//v}"
         dotnet pack -c Release -p:PackageVersion=$VERSION src/StringLiteralGenerator
     - name: Upload Artifact
-    - uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v2
       with:
         name: nupkg
         path: |