ci(Travis/Appveyor): Update Node versions in CI matrix (#3543)

* ci(.travis.yml,appveyor.yml): Update Node versions in CI matrix

Make Node-11 the new default and drop Node-9 from matrix.

.travis.yml

@@ -11,7 +11,7 @@ stages:
 
 # defaults
 language: node_js
-node_js: '10'
+node_js: '11'
 addons:
   apt:
     packages:
@@ -40,7 +40,7 @@ jobs:
 
     - &node
       script: npm start test.node
-      node_js: '9'
+      node_js: '10'
 
     - <<: *node
       node_js: '8'
@@ -75,7 +75,7 @@ jobs:
           - node_modules # npm install, unlike npm ci, doesn't wipe node_modules
 
     - <<: *smoke
-      node_js: '9'
+      node_js: '10'
 
     - <<: *smoke
       node_js: '8'

appveyor.yml

@@ -12,8 +12,8 @@ shallow_clone: true
 clone_depth: 1
 environment:
   matrix:
+    - nodejs_version: '11'
     - nodejs_version: '10'
-    - nodejs_version: '9'
     - nodejs_version: '8'
     - nodejs_version: '6'
 matrix:
@@ -69,4 +69,3 @@ notifications:
     on_build_success: false
     on_build_failure: false
     on_build_status_changed: false
-