update pull-request GitHub workflow to use FAKE

Author: beauvankirk

.github/workflows/pull-request.yml

@@ -11,15 +11,15 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Setup .NET Core
+    - name: Setup .NET 
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.301
+        dotnet-version: 5.0.202
     - name: Install tools
       run: dotnet tool restore
-    - name: Install dependencies
-      run: dotnet restore
-    - name: Build
-      run: dotnet build --configuration Release --no-restore
-    - name: Test
-      run: dotnet test --no-restore --verbosity normal
+    - name: Build Test and Docs using FAKE 
+      run: dotnet fake build
+
+
+
+