bringing appveyor.yml up to date with master

appveyor.yml

@@ -1,24 +1,48 @@
 version: 1.0.{build}
-image: Visual Studio 2017
-
-configuration: Release
+image: Visual Studio 2019
 
 before_build:
-- cmd: nuget restore src\Cardknox.sln
-
+ - cmd: nuget restore src\Cardknox.sln
+ 
 build:
   verbosity: minimal
 
 artifacts:
   - path: '\src\Cardknox.NET\bin\Release\Cardknox.API.Wrapper*.nupkg'
     name: NuGet
 
-deploy:
-  provider: NuGet
-  api_key:
-    secure: bsuOjvFlRd5YC/icDolLT+5pX2ejr4OujY/brObPlc4xSsMJY9I1Gvi9QFLgzYuh
-  skip_symbols: false
-  skip_tags: true
-  artifact: /Cardknox.*\.nupkg/
-  on:
-    branch: master
+for:
+
+-
+ branches:
+   only:
+     - master
+
+ configuration: Release
+
+ deploy:
+   provider: NuGet
+   api_key:
+     secure: bsuOjvFlRd5YC/icDolLT+5pX2ejr4OujY/brObPlc4xSsMJY9I1Gvi9QFLgzYuh
+   skip_symbols: false
+   skip_tags: true
+   artifact: /Cardknox.*\.nupkg/
+   on:
+     branch: master
+
+-
+ branches:
+   only:
+     - 5.0
+
+ configuration: Release
+
+ deploy:
+   provider: NuGet
+   api_key:
+     secure: bsuOjvFlRd5YC/icDolLT+5pX2ejr4OujY/brObPlc4xSsMJY9I1Gvi9QFLgzYuh
+   skip_symbols: false
+   skip_tags: true
+   artifact: /Cardknox.*\.nupkg/
+   on:
+     branch: 5.0