Fix CI

Author: galvesribeiro

.github/workflows/ci.yml

@@ -15,6 +15,6 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.0.100
+        dotnet-version: 3.1.100-preview1-014459
     - name: Build
       run: dotnet build --configuration Release

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.0.100
+        dotnet-version: 3.1.100-preview1-014459
     - name: Build
       run: dotnet build --configuration Release
     - name: Pack