(#4) Re-added environment config key

Simon Hofmann · Simon Hofmann · commit 28437c3fc72b · 2020-09-09T12:16:24.000+02:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -3,7 +3,9 @@
 image: Visual Studio 2017
 
 # Test against these versions of Io.js and Node.js.
-nodejs_version: "12"
+environment:
+  matrix:
+    - nodejs_version: "12"
 
 cache:
   - node_modules
