Change base image of app veyor to vs2019 as netcoreapp3.0 requires Vs2019

tebeco · tebeco · commit ff288cd20fa6 · 2020-02-19T10:09:10.000+01:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,6 +1,6 @@
 version: '{build}'
 skip_tags: true
-image: Visual Studio 2017
+image: Visual Studio 2019
 install:
 - ps: ./Setup.ps1
 build_script:
