ci(appveyor): add node 12, remove node 6
diff --git a/.appveyor.yml b/.appveyor.yml
index b809425..8b6be4c 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -15,9 +15,9 @@
   PLATFORM: windows-10-store
   JUST_BUILD: --justBuild
   matrix:
-    - nodejs_version: "6"
     - nodejs_version: "8"
     - nodejs_version: "10"
+    - nodejs_version: "12"
 
 platform:
   - x86