Added environment specifier

Simon Hofmann · Simon Hofmann · commit 8249bb3db2f8 · 2019-09-25T16:13:15.000+02:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -2,7 +2,8 @@
 
 image: Visual Studio 2017
 
-nodejs_version: "10"
+environment:
+  nodejs_version: "10"
 
 cache:
   - node_modules
