chore: update CI for current Node LTS

Audrey Eschright · Audrey Eschright · commit f6cef1cc904b · 2019-01-29T12:32:08.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,8 +2,6 @@ language: node_js
 sudo: false
 node_js:
   - "10"
-  - "9"
   - "8"
-  - "7"
   - "6"
-  - "4"
+  - "11"
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,11 +1,9 @@
 environment:
   matrix:
     - nodejs_version: "10"
-    - nodejs_version: "9"
     - nodejs_version: "8"
-    - nodejs_version: "7"
     - nodejs_version: "6"
-    - nodejs_version: "4"
+    - nodejs_version: "11"
 
 platform:
   - x64
