Re-added matrix specifier

Simon Hofmann · Simon Hofmann · commit c3550b7a48f6 · 2019-09-25T16:20:45.000+02:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -4,9 +4,9 @@ image: Visual Studio 2017
 
 environment:
   matrix:
-    nodejs_version: 10
-    nodejs_version: 11
-    nodejs_version: 12
+    - nodejs_version: 10
+    - nodejs_version: 11
+    - nodejs_version: 12
 
 cache:
   - node_modules
