- adds submodule update

Author: baywet

.github/workflows/dotnetcore.yml

@@ -15,6 +15,8 @@ jobs:
     - uses: actions/checkout@v2
     - name: Checkout submodules
       run: git submodule init
+    - name: Update submodules
+      run: git submodule update
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with: