try to fix appveyor.yml

bahusoid · bahusoid · commit 9a60c7b4ddb5 · 2020-04-27T13:00:46.000+03:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,4 +1,4 @@
-version: {build}
+version: '{build}'
 image: Visual Studio 2017
 environment:
   matrix:
