Add Node 9 to CI test environments

.travis.yml

@@ -13,6 +13,10 @@ matrix:
       dist: trusty
       sudo: false
       node_js: "8"
+    - os: linux
+      dist: trusty
+      sudo: false
+      node_js: "9"
   allow_failures:
     - os: osx
       osx_image: xcode8
@@ -23,6 +27,9 @@ matrix:
     - os: osx
       osx_image: xcode8
       node_js: "8"
+    - os: osx
+      osx_image: xcode8
+      node_js: "9"
 after_success:
   - npm install coveralls
   - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js

appveyor.yml

@@ -7,6 +7,7 @@ environment:
   - nodejs_version: "4"
   - nodejs_version: "6"
   - nodejs_version: "8"
+  - nodejs_version: "9"
 install:
   - ps: Install-Product node $env:nodejs_version x64
   - npm install -g npm@latest