VS 15 is 2017 version...

2019-02-19 02:06:19 +01:00 · 2019-02-19 02:06:19 +01:00 · 0b00ee7137
--- a/appveyor.yml
+++ b/appveyor.yml
@ -3,7 +3,7 @@ image: Visual Studio 2017
 build_script:
  - cmd: mkdir tmp
  - cmd: cd tmp
-  - cmd: cmake -G "Visual Studio 2017" ..
+  - cmd: cmake -G "Visual Studio 15 Win64" ..

 test_script:
  - cmd: cd tmp