Re-added node 11 and 12

Simon Hofmann · Simon Hofmann · commit 89ee63cf54c7 · 2019-09-25T16:17:51.000+02:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -4,6 +4,8 @@ image: Visual Studio 2017
 
 environment:
   nodejs_version: "10"
+  nodejs_version: "11"
+  nodejs_version: "12"
 
 cache:
   - node_modules
