Fix deployment (#515)

fgreinacher · web-flow · commit 00e7431dfea1 · 2019-09-29T10:39:35.000+02:00
Deployment steps were not executed since the changeover to the VS 2019 build image.
diff --git a/appveyor.yml b/appveyor.yml
@@ -39,7 +39,7 @@ for:
 -
   matrix:
     only:
-      - image: Visual Studio 2017
+      - image: Visual Studio 2019
   deploy:
   - provider: NuGet
     api_key:
