build: back to node 8.6 on appveyor

sidorares · sidorares · commit 88e1a01f5e12 · 2017-10-20T18:18:27.000+11:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -8,7 +8,7 @@ environment:
 
   matrix:
     - nodejs_version: "6.11"
-    - nodejs_version: "8.7"
+    - nodejs_version: "8.6"
       LINT: 1
 
 services:
